Owning rental apartment buildings in New York City means operating under some of the densest regulation in the United States. HSTPA, the Rent Stabilization Code, Local Law 11, Local Law 97, Good Cause Eviction, the Tenant Protection Act, lead-paint and Window Guard rules, DHCR registration, the ECB and HPD violation systems, and a steady flow of new city and state legislation all govern what a landlord can and cannot do. They also govern what acquisition underwriting should assume. This guide is the operating manual for NYC multifamily investors in 2026: which laws matter, what they require, and how compliance changes the investment math.
HSTPA and the rent-stabilization framework
The Housing Stability and Tenant Protection Act of 2019 is the most important piece of NYC rental legislation in 25 years. It eliminated high-rent vacancy decontrol and high-rent high-income decontrol, so units no longer leave stabilization when they hit a rent threshold. It capped Individual Apartment Improvement (IAI) rent increases at small dollar amounts amortized over 15 years. It capped Major Capital Improvement (MCI) increases to tenants at 2% per year over 12 years, with a 30-year sunset. And it locked in preferential rents: for leases signed after June 14, 2019, the rent generally cannot move from preferential to legal regulated rent on renewal.
Every NYC multifamily acquisition with stabilized units has to be underwritten against these rules. Pre-2019 comps, and pre-2019 thinking, overstate value-add upside every time.
Local Law 97 and building emissions
Local Law 97, part of the 2019 Climate Mobilization Act, sets annual greenhouse gas emissions limits for buildings over 25,000 SF. The limits started in 2024 and step down sharply in 2030 and again in 2050. A building over its limit pays $268 per metric ton of CO2-equivalent above the cap. For many older pre-war NYC multifamily buildings, meeting the 2030 limits will take real retrofit capex: building management system upgrades, boiler conversions, envelope work, and in some cases full electrification.
Underwriting on any building above 25,000 SF has to include a Local Law 97 analysis: current emissions, the 2024-2029 limits, the 2030 limits, and the capex needed to comply (or the fines to budget if compliance doesn't pencil). Local Law 97 is the largest new capex line to enter NYC multifamily underwriting since the post-9/11 cycle.
Good Cause Eviction (2024)
Good Cause Eviction, enacted in 2024, gives many non-stabilized NYC rental units defined-cause renewal protection. In general the landlord must renew the lease unless there is defined cause (non-payment, lease violations, and so on), and rent increases on renewal are limited to a defined reasonableness threshold. Some units are exempt: owner-occupied small buildings, certain higher-rent units, new construction within set periods, and condo/co-op units.
For free-market rental buildings that don't qualify for an exemption, Good Cause adds renewal protection that didn't exist before. Acquisition underwriting has to reflect it in turnover assumptions, mark-to-market rent assumptions, and the operating covenants in rent rolls and leases. Its full effect on operations is still taking shape as litigation and agency guidance develop.
DHCR registration and rent overcharge exposure
Every rent-stabilized unit in NYC has to be registered each year with the New York State Division of Housing and Community Renewal (DHCR). Registration sets the legal regulated rent for each unit and is the controlling record in any overcharge claim. HSTPA extended the look-back period for overcharge claims to six years in many cases, with treble damages where the overcharge is found willful.
A DHCR audit before acquisition is non-negotiable. Pull the full registration history for every stabilized unit and check it against the rent roll. Flag gaps, jumps, missing registrations, and any past decontrol claims. Then price in the overcharge exposure or walk.
Local Law 11 facade inspection
Local Law 11, also known as FISP (Facade Inspection Safety Program), requires periodic facade inspection and repair on every NYC building over six stories, on a five-year cycle. Missing a required filing or leaving repairs undone brings DOB violations, ECB penalties, and in some cases public-safety enforcement that affects tenant occupancy. Facade work typically costs $50K–$1M+ per cycle depending on building size, how complicated the scaffolding is, and the scope of repairs.
Diligence has to confirm the building's Local Law 11 status: current cycle filings, open violations, and any pending work. If the building is entering a new five-year cycle, reserve for the next round of facade capex at acquisition.
Operational obligations every NYC landlord runs continuously
- Annual DHCR registration of every stabilized unit
- Local Law 11 facade inspection and repair on the five-year cycle
- Local Law 97 emissions monitoring and annual reporting (buildings over 25,000 SF)
- Lead-based paint disclosure on every lease and unit turnover (pre-1960 buildings or where presence is presumed)
- Window Guard installation in any unit with a child under 11 (and on request)
- Annual inspection certificates for boilers, elevators, sprinklers, and fire alarms
- HPD violation cure within required timeframes (typically 21-90 days depending on hazard class)
- ECB hearings and penalty payment for any building violations
- Notice and consent requirements for various tenant-impacting actions under the Tenant Protection Act
- Lease offering rules (one-year, two-year, renewal forms) under the RGB and stabilization framework
Tax-abatement compliance: J-51, 421-a, 467-m, ICAP
Buildings with J-51, 421-a, 467-m, or ICAP tax abatements carry ongoing compliance obligations: the rent-stabilization status of affected units, affordability covenants, reporting requirements, and claw-back exposure if the owner falls out of compliance. The 421-a program in particular keeps generating disputes over affordable-unit compliance and rent-overcharge exposure.
Underwriting has to confirm abatement status, remaining term, the tax bill after expiry, and the compliance history. Many experienced multifamily buyers budget for abatement counsel and tax-certiorari advisors as a standard part of NYC diligence.
Rent Guidelines Board and annual stabilized rent increases
The New York City Rent Guidelines Board (RGB) sets the annual percentage by which stabilized rents can rise on lease renewal. It votes every year, usually setting separate percentages for one-year and two-year renewals. Increases have ranged from 0% (in the pandemic years) to roughly 4-5% on two-year renewals in more typical years. The 2024-2025 RGB cycle continued the moderate increases that have been the pattern since HSTPA.
Don't use RGB increases from the top of the historical range as your base case on a stabilized rent roll. The RGB responds to pressure from City Hall and Albany. Sober underwriting assumes 2-4% blended annual renewal increases on stabilized units and runs upside and downside cases as sensitivities.
Multiple Dwelling Law and building code obligations
Apart from rent regulation, NYC multifamily owners operate under the Multiple Dwelling Law (MDL), the NYC Housing Maintenance Code, and the NYC Building Code. Together they set minimum standards for heat (68°F day, 62°F night during heat season), hot water (120°F+), pest control, structural integrity, fire safety, and basic habitability. HPD and the DOB issue violations, and each has to be cured within a deadline set by hazard class.
Violations that persist or go unaddressed escalate: appointment of a 7-A administrator (HPD takes operational control of the building), criminal referrals for willful endangerment, and in extreme cases vacate orders. Disciplined owners cure violations as a routine part of property management, and institutional owners often keep compliance staff in-house or hire compliance vendors.
Tenant Protection Act: harassment, retaliation, and disclosure
Beyond HSTPA and Good Cause, the wider Tenant Protection Act framework spells out what owners may and may not do in dealing with tenants. Harassment of rent-stabilized tenants is a defined cause of action carrying treble damages and in some cases criminal liability. Retaliation is also prohibited against tenants who file complaints, organize, or assert their rights under stabilization or the housing code. Buyout offers must come with a written disclosure of tenant rights, and owners must observe the cool-off period after a tenant says no.
Owners who run buyout programs, renovate vacant units, or take on building-wide capex need a paper trail showing they followed these tenant-protection rules. Allegations of harassment or retaliation can lead to litigation, regulatory enforcement, and a cloud over the building during a sale that cuts into its value.
Lead paint, Window Guards, and other apartment-level obligations
Lead-based paint disclosure applies to every NYC apartment-building owner, on every lease and every unit turnover, in buildings built before 1960 (and some post-1960 buildings where lead is presumed). Owners must inspect every year in units where a child under six lives, abate any lead hazards found, and document compliance. Failures bring HPD violations, civil penalties, and personal injury exposure.
Window Guards must be installed in any apartment where a child under 11 lives, whether or not anyone asks, and within 30 days of any tenant request. Lead, Window Guards, smoke and carbon-monoxide detectors, bedbug disclosure under Local Law 69, and stove safety knobs make up a checklist NYC multifamily owners have to keep current on every unit.
How Skyline Properties handles regulatory diligence for clients
Skyline Properties' diligence and underwriting include DHCR registration audits, Local Law 11 and Local Law 97 analysis, tax-abatement verification, and a map of Good Cause Eviction exposure. Robert Khodadadian's $976M+ closed-deal record comes from a practice built on getting the regulatory work right. We treat regulation as a primary underwriting input from the first call, and our buyers and sellers are better off for it.
For owners thinking about a sale, cleaning up the regulatory items before marketing (DHCR registration current, ECB violations cured, Local Law 11 work documented, abatement compliance verified) consistently produces better pricing and faster closings. Skyline Properties' BOV names the regulatory items to fix first before a building goes to market.
Frequently asked questions
- What is the biggest regulatory change for NYC landlords in the last five years?
- HSTPA (2019) is still the biggest single change, because it rewrote the rent-stabilization framework. Local Law 97 emissions compliance and Good Cause Eviction (2024) are the most important additions since.
- Do all NYC apartment buildings have to comply with Local Law 97?
- Buildings over 25,000 SF are covered. Smaller buildings are exempt from the emissions caps but still subject to other energy reporting and building-code requirements. The 2024 and 2030 emissions step-downs apply only to covered buildings.
- Does Good Cause Eviction apply to rent-stabilized units?
- Rent-stabilized units are already governed by the Rent Stabilization Code and fall largely outside the new Good Cause framework. Good Cause mainly affects non-stabilized rental units that had no renewal protection before, subject to the law's exemptions.
- How often must I register stabilized units with DHCR?
- Every year. Failing to register exposes owners to overcharge claims with extended look-back periods, and treble damages where the overcharge is willful. Annual registration is one of the most important compliance obligations in NYC multifamily ownership.
- What are the penalties for Local Law 97 non-compliance?
- A building over its annual emissions cap pays $268 per metric ton of CO2-equivalent above the limit. For some older pre-war buildings facing the 2030 step-down, annual fines can reach six or even seven figures without a retrofit. Every covered building has to deal with it; whether to spend on retrofits or budget for fines is a deal-by-deal economic call.