No Certificate of Occupancy or a CO Mismatch in NYC: Can You Close?

Yes, it can still be sold, even with no certificate of occupancy (CO) or a use that differs from what its CO allows. No New York State or City law requires a CO to transfer a deed. Whether the sale actually closes depends on three things:

What the contract of sale says
Whether the buyer’s lender will make the loan
Whether the missing CO is a real problem, or just an old building that never needed one

This guide covers the five boroughs, where the Department of Buildings (DOB) issues COs. Westchester and the rest of the state work differently; see open permits and COs at a Westchester closing.

What a CO is and when a building needs one

A CO states a building’s legal use and occupancy: for example, a two-family home, or a store on the ground floor with two apartments above. DOB describes it as confirmation that completed work meets the law. A CO does not expire.

City building law sets three basic rules:

No CO, no occupancy. No building may be used or occupied without a CO.
A change needs a new CO. Changing a building’s type of occupancy, or making any change that doesn’t match the last CO, requires a new CO before the new use begins.
Older buildings are an exception. A building that existed before January 1, 1938 and was legally used without a CO may keep that use without one, as long as the use or occupancy type does not change.

That last rule explains most “no CO on file” results in older neighborhoods. A 1920s row house in Brooklyn or Queens that has always been a one- or two-family home often has no CO because none was ever required.

“No CO” can mean three different things

Situation	Typical cause	Usual fix
Pre-1938, use unchanged	No CO was ever required	Letter of No Objection
Post-1938, none on file	Missing or unindexed record	Records research; possibly a new CO
Use differs from CO	Conversion or added unit	Alteration filing and new or amended CO

Built before 1938, use unchanged. This is lawful. To prove legal use, the owner can ask the DOB borough office for a Letter of No Objection (LNO), DOB’s written confirmation that a building without a CO is used legally. DOB issues one when the use meets the Building Code and zoning rules and the occupancy load and exits are unchanged (DOB, Letter of No Objection or Completion). An owner can also apply for a full CO, but DOB grants it only if the building meets certain requirements of the 1968 building code, has no pending violations, and the current use is shown to have been legal. That is harder, and an LNO is usually what buyers and lenders ask for.

Built after 1938, no CO on file. A newer building should have a CO. When the search comes back empty, start with records research. Older COs sometimes sit in hard-to-find DOB scans, or the property’s lot or address has changed. If no CO was ever issued, the building is occupied without one, and the fix runs through DOB.

Use doesn’t match the CO. This is the most common real problem. The CO says one-family and the house has a rented basement apartment. The CO says two-family and the listing shows three units. The CO shows a store and the ground floor is an apartment. In each case, the actual use is not the legal use.

Where to find the CO

DOB splits its records by the date the CO was requested (DOB, Certificate of Occupancy):

Requested before March 1, 2021: search the address in BIS, DOB’s older Buildings Information System. Open the Property Profile and select View Certificates of Occupancy.
Requested on or after March 1, 2021: search the address in DOB NOW, DOB’s newer system, and select Certificate of Occupancy on the Property Profile.

Check both. A building can have an older CO in BIS and a later amended CO in DOB NOW. Read the most recent one, and read all of it. The CO lists the permitted use floor by floor, including the cellar or basement.

The listing, the building class on the Department of Finance (DOF) tax bill, and the number of gas or electric meters do not prove legal use. A house can have a two-family tax class and a one-family CO. Only the CO, an LNO or DOB’s records show what the building may legally be used for.

Is a CO problem a title problem?

No. This is a common error, including in AI-generated answers. A “cloud on title” is a claim against ownership: an old mortgage, a judgment, a competing deed. A missing or mismatched CO is about how the building may lawfully be used. It does not affect who owns the property or what claims are attached to it.

New York’s highest court drew this line in a 1993 decision. Whether title is sellable (“marketable”) depends on problems with title itself. A zoning rule in force when the contract is signed “regulates only the use of the property” and generally does not make title unmarketable. That case was not about a CO, but its reasoning applies by comparison (by analogy) to use and occupancy problems. The court added that parties who care about compliance should deal with it in their contracts.

Title insurance follows the same logic. The 2021 standard owner’s policy from the American Land Title Association (ALTA) excludes loss from laws “including those relating to building and zoning” that control use or occupancy. Its narrow coverage applies only where a government agency has recorded an enforcement notice in the land records. In NYC, the CO search in the title report is provided for information only and is not insured (NYC property violations at closing). The policy wording is discussed further in the Westchester open permits and CO guide.

So the title company will close over a CO problem, and the owner’s policy will not cover it. The buyer carries the risk unless the contract shifts it.

The contract decides who fixes it

Because the law does not require a CO to sell, the contract controls. NYC residential contracts and riders commonly handle COs in one of two ways:

The seller promises the use is legal and agrees to deliver a CO or LNO matching the current use.
The buyer takes the property “as is” for CO and use.

Many riders cap what the seller must spend to fix the problem, with a right to cancel if the cost goes over the cap.

The wording matters. A seller who promised a CO “for a two-family dwelling” and can’t produce one is in breach. A buyer who signed an as-is clause has accepted the problem. If the issue comes up after the contract is signed and the contract is silent, the 1993 decision makes it hard for the buyer to reject title on that ground alone.

Will a lender make the loan?

Lenders see legal use as a question about the collateral, and many will not lend against a use the CO does not support. These are lender and investor rules, not law, and they vary by loan program. For conventional loans sold to Fannie Mae, the appraisal must say which of three kinds the use is:

Legal
Legal but “grandfathered”: current zoning would not allow it, but it may continue because it began lawfully
Illegal

Fannie Mae’s selling rules accept the first two. A grandfathered use is accepted only where the appraisal reflects any harm to value and marketability.

In practice, a lender may:

Ask for the CO or LNO and compare it with the appraisal
Value the property at its legal use only (for example, as a one-family, ignoring basement rent)
Decline the loan if the appraiser reports an illegal use

If you are counting on rent from a unit the CO doesn’t show, expect the lender to leave that income out.

Rent from an illegal unit

The stakes rise when an illegal unit brings a building to three or more families. Under the state Multiple Dwelling Law, which applies in cities of 325,000 people or more, a building with three or more families living independently is a “multiple dwelling.” A building for not more than two families is a private dwelling (definitions).

A multiple dwelling may not be occupied until a certificate of compliance or occupancy is issued, apart from a few old-building exemptions described below (occupancy rule). If it is occupied anyway, the law provides that:

The owner may not collect rent for the time it was unlawfully occupied, or sue for rent or for possession for nonpayment.
The mortgage lender may declare the loan due.
The City may order the building vacated.

So a two-family-CO house with a third rented apartment is more than a lending problem. The owner may be unable to collect rent from that unit, and the building faces vacate risk. These rent rules do not apply to a lawful one- or two-family house. But a one-family CO with one illegal extra unit still raises the zoning, Building Code and lender issues above.

Do you need a CO to sell a house in NYC?

No. A deed can be signed and recorded without one. The CO matters because buyers, lenders and contracts ask for proof that the current use is legal, and that depends on the building’s age and use.

Building	Proof of legal use
Pre-1938 1-2 family, use unchanged	Letter of No Objection
Any building, post-1938	Most recent CO
Use changed after 1938	New or amended CO
3+ families (multiple dwelling)	CO, unless an old-building exemption applies

Buildings from before 1938. The cutoff in City building law is January 1, 1938. A building lawfully used before then may keep that use without a CO, but only while the use and occupancy type stay the same. Adding an apartment, turning a store into a home, or making a one-family into a two-family ends the exemption.

Letter of No Objection. An LNO is not a CO. It is DOB’s written confirmation that a building without a CO is used legally, requested from the borough office where the property is. DOB won’t issue one if the use, occupancy load or exits have changed. So an LNO request tends to turn up the same mismatch a CO search would.

Buildings of three or more families from before 1929 or 1909. These also fall under the Multiple Dwelling Law, which has its own, older cutoffs. It waives the certificate in only two cases:

Certain buildings that existed on April 18, 1929, did not need a CO before then, and have not been altered except as that law allows
Certain old tenement buildings, and certain apartment buildings built after April 12, 1901, that were occupied for the two years just before January 1, 1909, and have not been altered except as the law allows

Outside those cases, a three-family or larger building without a CO falls under the rent and vacate rules above.

How a mismatch gets fixed

The fix is a DOB filing, not something the title company clears. In outline:

An architect or engineer reviews the CO, the plans and the building. The question is whether the actual use can be made legal under current zoning and the Building Code, or whether the building must go back to its CO use.
The work is filed. A change that affects the CO is filed in DOB NOW: Build as an Alteration CO job, called ALT-CO, formerly Alteration Type 1 (DOB, Job Types in DOB NOW). Minor work that doesn’t affect the CO ends with a Letter of Completion instead.
The work is done and signed off. For a new or amended CO, DOB requires final construction, plumbing, elevator and electrical sign-offs, a final survey where needed, the PW3 cost affidavit, an approved Schedule of Occupancy (the floor-by-floor use list), and no open applications or violations on the property (DOB, Certificate of Occupancy).
The CO is requested in DOB NOW: Build, for both BIS and DOB NOW jobs.

If the use can’t be made legal, the fix is to remove the unit and go back to the CO use. A cellar apartment that fails ceiling height, light or exit rules is a common example. Either path can take months and requires clearing open violations first. That is why a contract deadline of a few weeks is rarely realistic. Related violations are covered in NYC property violations at closing, and open permits in open permits on a NYC sale.

Before you sign

Pull the CO yourself in BIS and DOB NOW before the contract. Compare it floor by floor with the listing and the building.
If no CO is on file, check the building’s age. Before 1938 with an unchanged use points to an LNO. After 1938 points to records research or a DOB filing.
Put the result in the contract: who delivers which document, by when, a cost cap, and what happens if it isn’t delivered.
Raise it with the lender early: will it lend on the CO or LNO use, and how will it treat any extra unit?
Rent from a unit the CO doesn’t show is at risk, especially in a building that would be a multiple dwelling with that unit.

For how the attorneys, title company and lender divide this work, see who does what at a New York closing.

Details for attorneys and title professionals

City building law sections. The no-occupancy-without-CO rule, the new-CO rules for a change in occupancy group or a change inconsistent with the last CO, the pre-1938 exemption, and the conditions for a CO on a pre-1938 building (retroactive requirements of the 1968 code, no pending violations, legal use shown) are all in the same article of the City’s Building Code, which is part of the Administrative Code. Section numbers are in Official sources.
The 1993 decision. It involved a seller’s failure to get subdivision approval, which the court held did not make title unmarketable. It is applied here by analogy.
The older multiple dwelling exemptions. The two exemptions use categories defined in the Multiple Dwelling Law. The 1929 exemption covers a Class B multiple dwelling. The 1909 exemption covers an old-law tenement, or a Class A multiple dwelling built after April 12, 1901, that has not been altered except in compliance with the Tenement House Law or the Multiple Dwelling Law. There is also a limited allowance for combining apartments that reduces the number of families.
Fannie Mae categories. The appraisal reports legal conforming, legal nonconforming (grandfathered) or illegal use. Fannie Mae buys loans on legal conforming use, or on legal nonconforming use where the appraisal reflects any adverse effect on value and marketability.

Official sources

Korvane Title is preparing to launch in New York. It is not licensed as a title insurance agent and does not accept title orders. Content on this site is general information, not legal advice.