If you bought, inherited, or started managing a rent-stabilized building in Brooklyn before 2019, some of what you "know" about the rules is out of date — and acting on the old version can be expensive. The Housing Stability and Tenant Protection Act of 2019 (HSTPA) is the most sweeping rewrite of New York rent law in decades, and it fundamentally changed the economics of owning stabilized housing. This guide breaks down exactly what changed, why it matters, and what it means for how you should run your building today.
For the full mechanics of rent stabilization itself — how to tell if a unit is covered, registration, and renewals — see our companion guide, NYC Rent Stabilization: A Complete Guide for Landlords. This post focuses specifically on what HSTPA changed.
What is HSTPA, and who administers it?
HSTPA was passed by the New York State Legislature in June 2019. It amended the state's rent stabilization laws (and several other tenant-protection statutes) that apply across New York City and other regulated areas of the state. Day-to-day administration of rent stabilization still runs through New York State Homes and Community Renewal (HCR), via its Office of Rent Administration — still widely called DHCR. The NYC Rent Guidelines Board (RGB) still sets the annual allowable increase percentages for one- and two-year renewal leases. HSTPA didn't replace these agencies — it rewrote the rules they enforce, generally in the tenant's favor and generally making it harder for an owner to increase rent or exit regulation.
Below is a summary of the core changes that matter most to owners of Brooklyn multifamily buildings.
The five biggest changes for owners
| Area | Before HSTPA (pre-2019) | After HSTPA (2019–present) |
|---|---|---|
| Deregulation | Units could exit stabilization via high-rent vacancy or high-income deregulation once rent crossed a threshold | Both paths eliminated — stabilized units generally stay stabilized indefinitely |
| Vacancy bonus | Owner could take an automatic increase when a unit turned over | Removed — no automatic turnover increase |
| IAIs | Larger spending caps, permanent rent increase, more frequent claims allowed | Spending caps lowered, increase is temporary and eventually rolls off, claims limited in frequency |
| MCIs | Shorter amortization, higher annual collection cap | Amortization periods lengthened, annual cap lowered, DHCR approval required before collecting |
| Preferential rent | Owner could often raise tenant to full legal rent at renewal | Preferential rent generally must be maintained for the life of the tenancy |
Each of these deserves a closer look, because the practical impact compounds.
1. Deregulation paths are gone
Before 2019, an owner had two theoretical off-ramps from stabilization: get the legal rent above a high-rent threshold at vacancy, or show the tenant's household income exceeded a cap. HSTPA eliminated both. If your underwriting model — or your predecessor's — assumed a stabilized building could gradually be freed to market rate, that assumption no longer holds. Plan around the building staying regulated for the foreseeable future.
2. No more vacancy bonus
The automatic percentage bump an owner used to get simply because an apartment turned over is gone. Today, when a stabilized tenant moves out, the new tenant generally takes over at the prior legal regulated rent (subject to applicable guideline increases and any legitimate IAI), not a reset rent. Turnover used to be a rent-growth opportunity; now it's mostly a vacancy-loss risk to be managed, not monetized.
3. IAIs and MCIs: much smaller, slower recovery
Individual Apartment Improvements and Major Capital Improvements are still legal ways to add a rent increase on top of the guideline percentage — but HSTPA sharply curtailed both. IAI increases are now temporary and capped at lower spending thresholds; MCI increases amortize over longer periods with a lower annual cap and require DHCR sign-off before you can collect anything. If you're budgeting a renovation expecting to recover the cost quickly through rent, model the real, current caps before you commit — our renovation and capital-improvement oversight work exists precisely because this calculation trips owners up. Always verify current dollar caps and formulas directly with DHCR, since they can be adjusted — treat any specific figure as provisional until you've confirmed it with DHCR rather than something to assume.
4. Preferential rent is now sticky
This is the change that catches the most owners off guard. A preferential rent is a rent charged below the registered legal regulated rent — often used to fill a unit or reward a good tenant. Pre-HSTPA, an owner could frequently raise the tenant to the full legal rent at the next renewal. Post-HSTPA, for the large majority of tenancies, the preferential rent must be maintained for the life of the tenancy, increasing only by the applicable RGB percentage each renewal — you generally cannot jump it to the legal rent. If your building carries preferential rents from a prior owner or an earlier lease-up, get clarity on exactly what you can and can't do before your next renewal cycle.
5. Stronger overcharge protections
HSTPA also extended the look-back period that DHCR and courts can review in a rent overcharge case and preserved exposure to treble (triple) damages for overcharges found to be willful. Clean, accurate rent registrations and documented rent histories aren't optional paperwork — they're your defense if a tenant ever challenges the rent years down the line.
HSTPA changes that apply beyond stabilized units
Some parts of HSTPA reach every residential landlord in New York, not just owners of stabilized apartments:
- Security deposits capped at one month's rent, with tighter procedures and timelines for returning them after move-out.
- Longer required notice periods for rent increases above a certain threshold and for lease non-renewals, scaled to how long the tenant has lived there.
- Extended timelines in eviction proceedings, including longer cure periods in nonpayment cases and additional procedural steps before a case can proceed.
- Anti-harassment protections around buyout offers — you can still offer a tenant a payment to voluntarily surrender an apartment, but the conversation is now regulated, with disclosure requirements and prohibitions on coercive or repeated contact.
If you own a mix of stabilized and free-market units — common across Brooklyn multifamily buildings — these statewide changes touch your entire portfolio, not just the regulated apartments.
Why this matters for how you underwrite and operate
The single biggest mental shift HSTPA demands is this: the value of a rent-stabilized building is now almost entirely an operating story, not a repositioning story. You are not buying a unit you'll eventually free to market rate. You're buying a stream of guideline-limited rent growth, and your return depends on how well you run the building around that reality:
- Underwrite off actual legal regulated rents — not a pro forma that assumes future deregulation or aggressive vacancy increases.
- Minimize vacancy and turnover cost. Since you can't reset rent at turnover the way owners once could, keeping good tenants and re-leasing quickly when a unit does turn over protects your bottom line far more than it used to. Our brokerage roots mean we routinely lease apartments in under seven days.
- Model IAI/MCI recovery realistically, using current caps, not pre-2019 assumptions.
- Keep registrations, renewals, and rent histories airtight, since HSTPA's extended look-back period means old mistakes stay exposed longer.
- Understand your source-of-income obligations. Many stabilized buildings house tenants using Section 8, CityFHEPS, or other vouchers, and the NYC Human Rights Law prohibits source-of-income discrimination — you generally cannot refuse an applicant because they'll pay with a subsidy. See our government housing programs overview and Section 8 voucher management services for how we handle this in practice.
Run a stabilized building this way — post-HSTPA rules built into how you operate rather than fought against — and it can be a durable, cash-flowing Brooklyn asset. Run it on outdated assumptions, and every renewal, renovation, and turnover becomes a compliance risk.
Common HSTPA mistakes we still see
- Trying to raise a preferential rent to the legal rent at renewal — this is the single most frequent post-2019 mistake.
- Underwriting a purchase assuming eventual deregulation — that off-ramp no longer exists.
- Budgeting a gut renovation expecting fast IAI payback — current caps make recovery smaller and slower.
- Skipping updated notice periods for rent increases or non-renewals, based on old timelines.
- Discussing a buyout informally, without the disclosures HSTPA's anti-harassment provisions require.
Every one of these is avoidable with current, accurate guidance — which is exactly what our rent-stabilization management service is built around.
Bring your building into the post-HSTPA world
HSTPA isn't a reason to avoid rent-stabilized property — Brooklyn's rental stock is full of well-run, profitable stabilized buildings. It's a reason to make sure your operations, your renewals, and your renovation math reflect the law as it actually stands today, not as it stood before 2019. At Yak Management, rent-stabilized and subsidized housing is our core specialty: we keep DHCR and HPD registrations current, manage preferential rent and IAI/MCI questions correctly, and handle voucher tenancies so owners stay compliant while protecting their return.
If you want a straight read on where your building stands under current law, schedule a property consultation or call 718-568-9278. We'll tell you honestly what needs attention.
This article is general information, not legal advice. HSTPA is complex, has been subject to litigation and subsequent clarification since 2019, and current dollar caps and percentages change. Consult a qualified New York attorney and verify current figures with DHCR/HCR before acting on your specific situation.