Buying a Townhouse or House in NYC: What's Different

Buying a townhouse, brownstone or one- to three-family house in NYC means buying the whole building and every obligation that comes with it. There's no board to approve you, but no managing agent fixes the roof either. The main differences from a co-op or condo are lower property tax (most houses are in Class 1), a legal unit count set by the certificate of occupancy, landmark rules in historic districts, and personal responsibility for the sidewalk and the sewer line under the street. Any tenants already living there come with the house.

Property tax: why houses often pay less

The Department of Finance puts most residential property with up to three units, including family homes and small mixed-use buildings with one or two apartments, in tax Class 1. Class 1 is assessed at 6% of DOF's market value, while Class 2 (apartment buildings, co-ops and condos) is assessed at 45%. Increases in Class 1 assessed value are also capped. The Class 1 tax rate is higher (19.843% for tax year 2026 vs 12.439% for Class 2), but it applies to a much smaller assessed value. Estimate a bill with the NYC property tax estimator and read NYC property tax classes.

The certificate of occupancy and the legal unit count

The certificate of occupancy (CO) states a building's legal use and occupancy, including how many apartments it may have. It matters for your mortgage, your insurance, your rental income and your exposure to violations. A "two-family plus garden unit" may legally be a two-family house, and the third unit may be illegal. Check:

• The CO itself, searchable by address in the Department of Buildings' systems, or the building's Roofy page. See how to read a CO.
• No CO? DOB says buildings built before 1938 aren't required to have one unless later alterations changed their use, egress or occupancy. Proof of legal use then comes from a DOB Letter of No Objection.
• Open permits and violations. Unfinished renovations without sign-off are common in older houses. DOB won't issue a new CO with open applications or violations, so they can block your own plans later. See reading DOB permits and clearing DOB violations.
• Basement and cellar units. See basement apartments in NYC and the City of Yes rules in adding an ADU.

Landmark and historic districts

Many brownstone neighborhoods are historic districts. The Landmarks Preservation Commission says owners of designated properties must get an LPC permit before work that affects the exterior, and in some cases the interior. That covers windows, doors, stoops, rooftop additions, rear extensions and facade repairs. LPC doesn't prevent changes. It reviews whether they fit the building's character, and applications go through its Portico portal. Before you sign, ask your attorney or architect to confirm the designation and any open LPC violations. Budget for longer timelines and historically appropriate materials. Browse designated buildings in the NYC landmark buildings report.

What to inspect (more than you think)

In a co-op or condo, the building's reserves pay for the roof and boiler. In a house, you do. Hire an inspector who knows NYC row houses, and add specialists where the general inspection flags something.

DEP says owners are responsible for all plumbing inside and outside the property, including the water and sewer service lines that run under the sidewalk and street to the city mains, and that most home insurance policies don't cover repairs. DEP offers an optional protection program through a partner company at $84.84 a year for the water line and $143.04 a year for the sewer line. See home inspections in NYC and budget for upkeep with the home maintenance budget calculator.

The sidewalk is yours

NYC DOT says property owners are responsible for installing, repairing and maintaining the sidewalk next to their property, including clearing snow, ice and debris (Administrative Code §19-152). DOT also says owners are potentially liable for injuries caused by failing to keep the sidewalk free of defects (§7-210); how that applies depends on your property's use and occupancy, so ask your attorney. A Notice of Sidewalk Violation carries no fine, but it is filed with the County Clerk, gives the owner 75 days to repair, and can complicate a sale or refinance. Check whether there's an open Notice of Sidewalk Violation before closing, and make sure your homeowners policy includes liability coverage. See who fixes the sidewalk.

Tenants in place

If the house has tenants, you buy subject to their rights. Get copies of every lease, the rent roll and security deposit records before you sign. Leases usually survive a sale (see what happens to a lease when a building is sold). A long-term tenant in an older house may be rent regulated. HCR says rent control generally applies to buildings constructed before 1947. Ask the seller to request the apartment's rent history from HCR. Planning to live in a unit that a tenant occupies now? Have your attorney confirm what is legally required to recover it before you count on moving in. For the investor view, see buying a two- to four-family house and run the numbers with the rental property cash flow calculator.

How the purchase process differs

1. 1

   No board, but a full title search

   You buy real property with a deed, so you need title insurance and a survey. Your attorney clears liens, open DOB/ECB violations and unpaid water charges at closing.
2. 2

   Inspection before contract

   Do the inspection and any specialist reviews (sewer scope, roof, structure) before you sign, because the 10% deposit is typically at risk after.
3. 3

   Mortgage recording tax applies

   Unlike a co-op loan, your mortgage on a house is recorded and taxed. Estimate it with the mortgage recording tax calculator.
4. 4

   Insurance is a full homeowners (HO-3 style) policy

   You insure the whole structure, not just the interior. See homeowners insurance basics.
5. 5

   Down payment help still applies

   HPD’s HomeFirst program covers one- to four-family homes for eligible first-time buyers, subject to HUD price limits by unit count.

Price the purchase with the NYC closing cost calculator and mortgage recording tax calculator, and read homeowners insurance basics and flood insurance in NYC. Many low-lying houses are in mapped flood zones.

Townhouse vs condo: the honest trade-off

A house gives you control: no board, no house rules, room to expand (within zoning, DOB and LPC limits), and often rental income from a second unit. In return you take on every repair, the sidewalk, the sewer line, compliance filings and scheduling contractors. A condo spreads those costs across many owners through common charges and reserves. If you're unsure, compare the true monthly cost of each with the true monthly cost of owning in NYC, then follow the full process in how to buy a home in NYC.