There's a particular moment of panic that hits tenants when they learn their building has been sold: what happens to my security deposit? You handed a month's rent to a landlord who no longer owns the building. The new owner never took your money — the old one did. So when you eventually move out, who owes you your deposit back? The old landlord, who's gone, cashed out, and has no reason to return your call? Or the new one, who'll shrug and say "I never got a deposit from you, that's between you and the previous owner"? Caught in that gap, a lot of tenants quietly assume their deposit has simply vanished into the transaction — lost somewhere between two owners, neither of whom seems responsible for it.
Here's the reassurance, and it's grounded in law that was built for exactly this situation: your deposit does not vanish when the building is sold. The obligation to return it transfers with the building. New York law treats your deposit as your money, held in trust — never the landlord's to keep or spend — and it provides that when a building changes hands, the responsibility for that deposit passes to the new owner, so that you are not left chasing a former landlord who's disappeared. In fact, the law goes further: even if the old owner fails to properly hand your deposit over to the new one, the new owner can still be liable to you for it. The gap tenants fear — where the deposit falls between two owners and neither is responsible — is precisely the gap the law was designed to close.
This protection is paired with two others that explain why your deposit is so well protected: the requirement that landlords hold deposits separately, in trust, never mixed with their own money (the anti-commingling rule), and, for larger buildings, the requirement that deposits be held in interest-bearing accounts with the interest belonging to you. Together, these rules reflect a single principle — your deposit is your money, held in trust for you, and it stays protected through changes of ownership, can't be treated as the landlord's asset, and in larger buildings even earns you interest. This guide explains all of it: how the deposit survives a sale, why the new owner can be on the hook, what the commingling rules mean and why they matter, and how the interest rules work. It's general information rather than legal advice for your specific situation, and there's a scope note about which units these rules cover. But if your building has been sold, or might be, this is the guide that explains why your deposit is much safer than it feels.
Everything about why your deposit survives a sale flows from one foundational principle, so it's worth establishing first: your security deposit is not the landlord's money. It never becomes the landlord's money. It remains your money throughout the tenancy, and the landlord merely holds it — in trust — for you.
New York law is explicit about this. The statute governing security deposits provides that the money you deposit "shall continue to be the money of the person making such deposit" — that is, yours — and "shall be held in trust" by the landlord, and "shall not be mingled with the personal moneys or become an asset of the person receiving the same." Read those phrases carefully, because each one matters. Your deposit continues to be your money — ownership never transfers to the landlord. It's held in trust — the landlord is a custodian, not an owner, of it. And it cannot become an asset of the landlord — it's not part of their property, not something they own, not something that belongs to them in any sense.
This trust-fund status is the key that unlocks everything else in this guide, so let it sink in. Because the deposit is your money held in trust rather than the landlord's asset, several things follow naturally. It can't simply be spent or absorbed by the landlord. It can't be treated as part of the landlord's estate or assets. And — crucially for our purposes — it can't just disappear when the landlord sells the building, because it was never the landlord's to keep in the first place. A landlord selling a building is selling their property; your deposit isn't their property, so it doesn't get sold along with the building or pocketed as part of the deal. It remains what it always was: your money, which must be accounted for and ultimately returned to you.
Understanding this reframes the whole "what happens to my deposit when the building sells" question. The deposit isn't a debt the old owner owes you that might get lost when they exit; it's your money that was always being held for you, and the law's job at a sale is simply to make sure the custody of your money passes cleanly to the new owner so it keeps being held for you. The trust principle is why the deposit is protected through a sale rather than vulnerable to it. Once you see the deposit as your money held in trust — not the landlord's to lose — the survival of your deposit through a sale stops being surprising and starts being the obvious consequence of what a deposit legally is.
With the trust principle established, let's look at exactly how the protection operates when a building is sold, because the law builds a genuine safety net here — one specifically designed to prevent your deposit from falling into the gap between the old owner and the new.
The basic mechanism is transfer. When a building is sold, the law contemplates that the deposits held for the tenants are turned over to the new owner, who then holds them in trust just as the old owner did. The obligation follows the building. Your deposit is supposed to move from the old owner's custody to the new owner's custody as part of the transaction, so that there's always someone holding your money in trust for you, and that someone is the current owner of the building you live in. In the ordinary case, this is how it works: the deposit transfers, the new owner holds it, and when you move out, the new owner is the one who returns it.
But the law anticipates that old owners don't always do the right thing — that a departing owner might fail to properly turn over the deposits — and it builds in protection for exactly that failure. This is the part tenants most need to know, because it's what closes the scary gap. New York law provides that where a deposit is not turned over to the successor owner, the new owner (the grantee or assignee of the building) is also liable to the tenant for repayment of the deposit, plus accrued interest, as to deposits of which the new owner has actual knowledge. In plain terms: even if the old owner pockets your deposit or fails to hand it over, the new owner can still be on the hook to return it to you. You are not left chasing the vanished old owner as your only recourse; the current owner of your building can be directly liable to you.
And the law defines "actual knowledge" broadly, in tenant-favorable ways, so that new owners can't easily claim ignorance. A new owner is deemed to have actual knowledge of a deposit that was, for example, placed in a bank account in the months leading up to the sale, or acknowledged in a lease that was in effect at the time of the sale, or otherwise supported by documentary evidence. Think about what that covers: if your deposit is mentioned in your lease (as deposits routinely are), the new owner is deemed to know about it, which means the new owner can be liable for it even if the old owner never handed it over. Your lease itself, sitting in the building's records, is often enough to put the new owner on the hook.
It's worth unpacking these "actual knowledge" categories a bit more, because they're deliberately structured to catch the ordinary case rather than some rare one. The first category — a deposit placed in a banking account in roughly the six months before the closing — is aimed at deposits the old owner was actually holding as required; if the money was sitting in a proper deposit account in the run-up to the sale, the new owner is charged with knowing about it. The second category — a deposit acknowledged in a lease in effect at the time of transfer — is the one that covers most tenants, because leases almost always recite the security deposit and its amount, and a new owner takes the building subject to the existing leases, which they're expected to review. The third — a deposit supported by documentary evidence provided to the new owner — is a catch-all for other proof. The common thread is that the law didn't make "actual knowledge" a demanding, hard-to-establish standard that new owners could easily dodge; it made it something that the ordinary paper trail of a normal tenancy — a lease reciting the deposit, a deposit held in an account — will typically satisfy. That's a tenant-friendly design: it means the protection isn't reserved for tenants with unusual documentation but is available to the ordinary tenant whose deposit appears in an ordinary lease.
This is also why a new owner's due diligence doesn't get you off the hook of keeping records — quite the opposite. The new owner is deemed to know what a reasonable review of the building's leases and accounts would show, but your own copy of your lease and your payment records are what let you prove the deposit and its amount if the new owner claims ignorance anyway. The law puts the new owner in a position where they should know, and your documentation is what holds them to it. The two work together: the law's broad "actual knowledge" standard makes the new owner responsible, and your records make that responsibility enforceable.
Put the pieces together and the safety net is robust. In the normal case, your deposit transfers to the new owner, who returns it when you leave. In the bad case, where the old owner fails to transfer it, the new owner can still be liable to you for it, especially where — as is typical — your deposit is documented in your lease. The result is that the gap tenants fear, where the deposit is lost between two owners, is largely closed: the law works to ensure there is always a responsible party, and that party is generally the current owner. You are not the one who has to absorb the old owner's failure to transfer your money.
Knowing your deposit survives a sale is reassuring, but there are concrete steps you can take to protect yourself when ownership changes, because the protection works best for the tenant who has their documentation in order. Here's what to do.
Preserve proof that you paid a deposit, and its amount. The single most important thing is being able to prove you paid a deposit and how much it was, because your ability to recover it — from either owner — depends on establishing it exists. Keep your lease (which typically states the deposit amount), your payment records (the canceled check, the receipt, the bank record showing the payment), and any correspondence acknowledging the deposit. This documentation is what establishes the new owner's "actual knowledge" and proves your claim. If your deposit is stated in your lease, that lease is a key document — keep it safe.
Get written confirmation of the transfer if you can. When you learn of the sale, it's reasonable to ask — in writing — for confirmation that your deposit has been transferred to the new owner and is being held for you. A responsible new owner should be able to confirm they're holding your deposit. Getting this in writing gives you a clear record of who has your money and their acknowledgment that they hold it.
Identify and keep records of the new owner. Find out who the new owner is and how to reach them, and keep that information, because they're now generally the party responsible for your deposit. The new owner (or their managing agent) is who you'll deal with about the deposit going forward, so knowing their identity and contact information matters.
Don't accept "that's between you and the old owner." If the new owner tries to disclaim responsibility — telling you your deposit is the old owner's problem, not theirs — understand that this is often not correct as a matter of law. Where the new owner has actual knowledge of your deposit (as they're generally deemed to have when it's documented in your lease), they can be liable for it even if the old owner didn't turn it over. So a new owner's attempt to wash their hands of your deposit is not the last word; you may have a direct claim against them. Don't be talked out of your deposit by a new owner who insists it's not their responsibility.
Keep your documentation through the whole tenancy. Because a sale can happen at any time — even years into your tenancy, or right before you move out — hold onto your deposit documentation for the entire tenancy, so that whenever a sale happens and whenever you eventually move out, you can establish your deposit and claim it from whoever is responsible.
Understand you may have more than one party to look to. The new owner's potential liability doesn't necessarily extinguish the old owner's — depending on the circumstances, an old owner who wrongfully failed to turn over your deposit or otherwise mishandled it may still bear responsibility too. The point of the transfer-and-successor-liability rules isn't to let the old owner off the hook so much as to guarantee that you have a solvent, reachable party (typically the current owner) to claim against, rather than being left with only a vanished former landlord. So if you're caught in a sale situation, don't assume you're limited to one target; an advocate can help you figure out who to pursue, and the existence of new-owner liability means you're not dependent on tracking down someone who's disappeared. The law's goal is that your deposit is recoverable, and it builds in more than one potential source of recovery to make that real.
The throughline is that your protection is strongest when you can prove your deposit exists and its amount, because that proof is what triggers the new owner's liability and what supports your claim against either party. The law does the heavy lifting of making the deposit survive the sale; your job is to keep the records that let you enforce that protection.
Paired with the trust principle is a specific, powerful requirement that explains a lot about why deposits are protected: the landlord must hold your deposit separately, and may not commingle it with their own money. Understanding this rule illuminates both why your deposit is safe and what it means when a landlord violates it.
The law requires that your deposit be held in trust and not be mingled with the landlord's personal money or become an asset of the landlord. "Commingling" is the term for a landlord violating this — mixing your deposit funds together with their own money, treating it as part of their general funds rather than keeping it separate and in trust. The rule against commingling is not a technicality; it goes to the heart of what a deposit is. Because your deposit is your money held in trust, it has to be kept segregated from the landlord's own funds, so that it remains identifiable as yours and doesn't get absorbed into, spent as, or lost among the landlord's assets. A landlord who dumps your deposit into their general operating account, mixing it with their own money, has violated the trust and broken the separation the law requires.
Why does this matter so much to you? Several reasons. Keeping the deposit separate is what keeps it safe — segregated, held in trust, it's protected from being spent, from the landlord's creditors, from being treated as the landlord's asset in the landlord's own financial troubles or a sale. Commingling, by contrast, is exactly how deposits get misappropriated and lost: once your money is mixed with the landlord's and treated as theirs, it can be spent, seized, or simply disappear into the landlord's finances. The separation requirement is the practical safeguard that makes the trust principle real — it's not enough that the law says your deposit is your money; it also has to be kept separate so that it actually remains recoverable as your money.
And commingling has consequences for a landlord who does it. Under New York law, a landlord's improper commingling of the deposit can cost the landlord the right to keep any of it — a landlord who has commingled the deposit can be required to return it in full, forfeiting any right to offset it against claimed damages. The logic is that a landlord who violated the trust by commingling has forfeited the benefit of holding the deposit; having mishandled your money by mixing it with their own, they lose the right to make deductions from it and must return the whole thing. So commingling isn't just a rule landlords are supposed to follow — violating it can hand the tenant the entire deposit back, regardless of any damage claims. (There's a nuance worth noting: courts have recognized that a landlord who commingled but then corrected it during an ongoing tenancy may not automatically forfeit — the harshest consequence attaches to genuine, uncorrected violations — so the specifics matter, which is another reason to get advice if commingling is at issue.)
The practical significance for you is twofold. First, the separation requirement is a big part of why your deposit is protected through events like a sale — because it's supposed to be sitting separately, in trust, identifiable as yours, rather than mixed into the landlord's funds where it could vanish. Second, if you have reason to believe a landlord commingled your deposit — treated it as their own money, couldn't account for it as a separate trust fund — that violation may itself entitle you to the full return of your deposit, independent of any dispute about the apartment's condition. Commingling is both a reason your deposit is safe and, when it happens, a potential basis for getting all of it back.
How would you even know if a landlord commingled your deposit? You often can't know for certain from the outside, but there are signs and there's a step you can take. New York law also requires a landlord who places your deposit in a banking organization to notify you, in writing, of the name and address of the bank holding it and the amount deposited. That notification requirement is itself a window into whether your deposit is being held properly: a landlord who can readily tell you which bank holds your deposit, in what account, is a landlord treating it as the separate trust fund it's supposed to be; a landlord who can't or won't identify where your deposit is being held separately may be one who commingled it into their general funds. So one concrete thing you can do is ask — request, in writing, the bank name and account information for where your deposit is held. The answer (or the evasion) tells you something. And in a dispute, a landlord's inability to account for your deposit as a segregated trust fund — as opposed to money mixed into their operating account — is evidence of commingling that can support your claim to the full deposit back.
Why do landlords commingle, given the risk? Usually not out of malice but out of sloppiness or cash-flow convenience — it's easier to dump all incoming money into one account than to maintain proper segregated trust accounts, and a landlord treating deposits as free working capital can use them to cover expenses. But the law treats deposits as inviolate trust money precisely to stop that, because a landlord who's spent your deposit as working capital is a landlord who may not have it when you need it back — which is exactly the misappropriation the separation rule exists to prevent. The rule protects you from the landlord who would, deliberately or carelessly, treat your deposit as their own spending money, by making that treatment a violation with real consequences.
The third piece of the picture, and one many tenants don't realize applies to them, is that in larger buildings your deposit is supposed to be held in an interest-bearing account, with the interest belonging to you. This is a genuine benefit tenants routinely fail to claim.
New York law requires that when a deposit is for a building containing six or more family dwelling units, the landlord must deposit it in an interest-bearing account at a New York banking organization. The interest that account earns is, for the most part, your money — the law provides that the interest belongs to the tenant who made the deposit, with the landlord entitled to retain a modest administrative fee (an amount equivalent to one percent per year of the deposit) in lieu of other custodial expenses. So in a building of six or more units, your deposit should be sitting in an interest-bearing account, and the interest it earns — beyond that small administrative cut — is owed to you, either paid annually or when you move out.
A few things follow from this that are worth knowing. First, this is a real, and realistically underclaimed, right: the compliance gap here is significant, and a great many tenants who are legally entitled to interest on their deposits never receive it, either because the landlord didn't hold it in an interest-bearing account as required or simply never paid the interest over. If you're in a building of six or more units, you may be owed interest you've never received — worth asking about. Second, the interest requirement is another expression of the trust principle: because the deposit is your money, the earnings on it are largely yours too, not a windfall for the landlord. Third, failure to comply with the interest requirements is a real violation with real exposure for landlords — this is an area of active enforcement, including litigation over landlords' failure to properly hold deposits in interest-bearing accounts and pay tenants their interest.
For buildings with fewer than six units, the interest requirement operates differently — the strict interest-bearing-account mandate is tied to the six-or-more threshold — but the core trust principles (your money, held in trust, not commingled) still apply. So the interest benefit specifically is a larger-building feature, while the fundamental protections apply across the board.
If you're in a six-or-more-unit building and want to pursue interest you may be owed, a few practical steps help. Start by confirming your building's size — six or more family dwelling units is the trigger. Then check whether you ever received the required notice telling you which bank holds your deposit; if your deposit was supposed to be in an interest-bearing account and you never got interest paid out (annually or at move-out), that's worth raising. You can ask the landlord, in writing, for an accounting of the interest earned on your deposit and for payment of the interest owed to you (less the permitted one-percent administrative fee). Keep this in mind especially at move-out, when any accumulated interest should be reconciled along with the deposit itself. The sums are usually modest — interest on a one-month deposit over a few years — but the obligation is real and cumulative, and it belongs to you, not the landlord.
The practical takeaway: if you live in a building with six or more units, be aware that your deposit should be earning interest for you, that the interest (less a small administrative fee) is yours, and that you may be entitled to interest you haven't received. It's a modest sum in most cases, but it's yours, and it's another illustration of the overarching principle that a security deposit is the tenant's money that the landlord merely holds — earnings and all. It's also a useful diagnostic: a landlord who properly holds your deposit in a dedicated interest-bearing account and pays you the interest is a landlord handling your deposit the way the law requires, while a landlord who never set up such an account, in a building where it's required, has likely mishandled your deposit in a way that connects back to the commingling concerns above.
Let's watch these protections work by following a tenant through a building sale.
Imagine a tenant who paid a $2,000 deposit when she signed her lease three years ago. The deposit amount is stated right in her lease. Midway through her tenancy, she gets a notice: the building has been sold to a new owner. She doesn't think much of it at first — but when she eventually gives notice that she's moving out, and asks the new owner about her deposit, she gets an alarming response: "We didn't receive any deposit for your unit from the previous owner. You'll have to take that up with them." The old owner, meanwhile, is unreachable — sold the building, moved on, ignoring her calls. She's staring into exactly the gap tenants fear: two owners, and neither one seems responsible for her $2,000.
Run it the way an uninformed tenant would. She takes the new owner's disclaimer at face value, assumes her deposit is the old owner's responsibility, tries fruitlessly to reach the vanished old owner, and eventually gives up, concluding her $2,000 evaporated in the sale. The gap swallowed her deposit — not because the law allowed it, but because she didn't know the law didn't.
Now run it informed. She knows her deposit is trust money that survived the sale, and that the new owner can be liable for it even if the old owner never handed it over — especially because her deposit is documented in her lease, which gives the new owner "actual knowledge" of it. So she doesn't accept "that's between you and the old owner." She responds, in writing, that her deposit is acknowledged in her lease (which was in effect at the time of the sale), that under New York law the new owner is liable for a deposit of which they have actual knowledge even if it wasn't turned over, and that she expects her deposit returned per the law. She has her lease and her original payment record ready as proof. The new owner, confronted with a tenant who knows the deposit survived the sale and that they can be on the hook for it, is in a very different position than they'd hoped — and she has a direct, enforceable claim against them rather than a hopeless chase after the old owner.
Same tenant, same $2,000, same sale, same disclaiming new owner. In one version her deposit disappears into the gap between owners; in the other she recovers it from the new owner, because she understood that the deposit survived the sale and that the current owner — with knowledge of a deposit documented in her lease — was responsible for it. The difference was knowing that "take it up with the old owner" is often simply not the law.
These protections are strong, and a little knowledge and record-keeping let you enforce them, so a few practical notes to close.
A local tenant-rights organization, legal aid office, or tenant help resource can help you understand how these rules apply to your situation, determine who's responsible for your deposit after a sale, and pursue a claim if a new owner wrongfully disclaims responsibility or a landlord commingled your deposit or failed to pay owed interest. Many of these resources are free. If a new owner refuses to honor your deposit after a sale, or you suspect commingling or unpaid interest, these are exactly the situations where advocates and, if needed, small claims court can help — and a deposit claim backed by your lease and payment records is a strong one.
Protect yourself with documentation, which is the throughline of everything here. Keep your lease (which typically documents your deposit and is what gives a new owner "actual knowledge"), your proof of payment, and records of any ownership change and the new owner's identity. This documentation is what lets you establish your deposit and claim it from whoever is responsible, and it's what makes the law's protections real for you rather than theoretical. Keep it all for the entire tenancy, since a sale can happen at any time.
A few honest caveats to keep this accurate. These deposit rules primarily govern free-market (non-rent-stabilized) units; rent-stabilized units are governed by a different section of the law with its own rules, so confirm your unit's status. The interest-in-an-interest-bearing-account requirement specifically applies to buildings of six or more units. And New York's deposit laws have continued to evolve, including recent amendments, so verify the current specifics or get advice for your situation rather than relying on general figures. None of these caveats changes the core: your deposit is trust money that survives a sale, must be held separately, and in larger buildings earns you interest.
It's also worth remembering that these protections layer on top of the other deposit rules that apply regardless of a sale — the requirement to return the deposit with an itemized statement within fourteen days of move-out, the landlord's burden to justify any deductions, and the exposure to punitive damages for willful violations. A sale doesn't suspend any of those; it just adds the question of who holds the responsibility, which the transfer and successor-liability rules answer. So when you eventually move out of a building that changed hands, the current owner steps into all of the ordinary deposit obligations — the deadline, the itemization, the burden of proof — and you hold them to those exactly as you would any landlord.
Step back and see the principle that ties all of this together, because it's the antidote to the panic a building sale provokes. A security deposit is not the landlord's money and never becomes the landlord's money — it is your money, held in trust for you, from the day you pay it to the day it's returned. Everything else follows from that. Because it's your money held in trust, it can't just be spent or absorbed as the landlord's asset. Because it's your money held in trust, it must be kept separate from the landlord's own funds, and commingling it is a violation that can cost the landlord the right to keep any of it. Because it's your money held in trust, in larger buildings it earns interest that belongs to you. And because it's your money held in trust, it survives a sale — the obligation transfers to the new owner, who can be liable to you for it even if the old owner failed to hand it over, so that you are not left chasing a landlord who's gone.
That last protection is the one that matters most in the moment of panic, so hold onto it: when your building is sold, your deposit does not vanish into the transaction. The law was specifically designed to prevent it from falling into the gap between owners. The new owner generally becomes responsible for it, and where your deposit is documented — as it typically is, right in your lease — the new owner is deemed to know about it and can be directly liable to you for its return. "Take it up with the previous owner" is a brush-off, not a legal reality.
So if your building has been sold, or is being sold, don't assume your deposit is lost. Keep your lease and your proof of payment, find out who the new owner is, get written confirmation that your deposit is being held for you if you can, and don't accept a new owner's attempt to disclaim responsibility — because the law makes your deposit survive the sale precisely so that a change of ownership can't be used to make your money disappear. Your deposit is yours: through the tenancy, through a sale, and until the day it's rightfully returned to you. Find out where you stand.
