1. When Is a Rental Apartment Legally Approved?
A finished basement or additional kitchen does not establish lawful residential use. The answer depends on building history, authorized occupancy, and required approvals.
Certificate of Occupancy and Residential Use
Under NYC Administrative Code § 28-118, buildings generally need a Certificate of Occupancy (CO) or applicable temporary approval before use. The CO identifies permitted occupancy; changes in use, occupancy classification, or exits may require an amended certificate. Converting a two-family house into three apartments can require permits, compliant construction, and updated occupancy approval. A separate utility meter does not replace these steps.
Older Buildings and Historical Use
Certain buildings constructed before 1938 may be exempt from the CO requirement if later work did not change use, occupancy, or exits. An owner may seek a DOB Letter of No Objection (LNO), supported by historical plans and records. An LNO documents qualifying historical use; it does not authorize an unlawful conversion.
2. Which Records Should Buyers and Tenants Check?
Ownership records show who holds an interest in the property. DOB records address whether its actual configuration matches approved residential use.
DOB Records and Construction Sign-Offs
The Building Information System (BIS) and DOB NOW Public Portal provide occupancy, permit, complaint, and violation information. Review the CO, alteration plans, inspection results, and outstanding violations together. An issued permit does not prove that work received its final sign-off. Likewise, a missing online CO does not necessarily indicate illegal occupancy in an older building.
Ownership, Zoning, and Purchase Terms
NYC ACRIS provides recorded deeds and mortgages for Queens; ZoLa identifies zoning districts. Neither system, by itself, confirms that an additional apartment is lawful. Before a real estate transaction, compare the listing's unit count, existing leases, contract, and DOB records. If they conflict, the parties can address corrective work and costs in the purchase terms.
3. Can Basements, Cellars, and Adus Be Rented?
Below-grade spaces have additional safety and approval requirements. A previously rented apartment is not necessarily an authorized unit.
Basement and Cellar Requirements
NYC rules distinguish basements from cellars by how much of the space lies below the relevant ground level. Legal residential use depends on applicable standards for light, ventilation, sanitation, ceiling height, and safe exits. Cellar occupancy is particularly restricted. Some newer ancillary dwelling unit (ADU) provisions allow qualifying units, but a landlord still needs the required approvals.
New Adus and the Queens Pilot
Local Law 127 of 2024 provides a route for qualifying ADUs at one- and two-family properties. Local Law 80 of 2026 separately addresses certain cellar ADUs in newly built one- and two-family homes. Local Law 126 of 2024 concerns a different pilot for pre-existing basement and cellar units. Queens Community District 2 is included, but units must meet conditions including qualifying occupancy before April 20, 2024.
As of October 2026, DOB has not opened applications for Authorization for Temporary Residence under that pilot pending implementing rules. These programs should not be treated as automatic legalization. Related land use and zoning requirements still apply.
4. What Happens after an Illegal-Occupancy Finding?
City enforcement may require physical correction, administrative proceedings, or evacuation. Rent and possession questions follow separate state-law standards.
DOB Complaints and Vacate Orders
Residents can report suspected illegal conversions through NYC 311. DOB may inspect, issue violations, require restoration or permitted work, and order residents to vacate unsafe spaces. The Queens DOB Borough Office is at 120-55 Queens Boulevard, Kew Gardens. It handles inquiries about permits, occupancy records, and LNO requests.
OATH Hearings and Correction
DOB summonses may be heard by the Office of Administrative Trials and Hearings (OATH). Respondents must follow their summons deadlines to avoid possible defaults and penalties. Correcting a cited condition may require permits, inspection, and an approved Certificate of Correction through DOB NOW: Safety. Paying a penalty alone does not resolve the violation. Related real estate regulatory compliance questions depend on the work required.
Housing Court and Rent Recovery
Queens Housing Court, at 89-17 Sutphin Boulevard, Jamaica, handles qualifying nonpayment and possession proceedings.
Under New York Multiple Dwelling Law §§ 301–302, unlawful occupancy of a qualifying multiple dwelling may restrict rent recovery and nonpayment-based possession claims. The result depends on building classification, the required occupancy approval, and statutory exceptions, not merely the existence of an unapproved unit. Other landlord-tenant law rules may also apply.
5. Frequently Asked Questions
Can a Tenant Get Help After a Vacate Order?
Displaced occupants may qualify for emergency relocation services through NYC Housing Preservation and Development (HPD), even when the unit was unauthorized. Assistance depends on program eligibility and circumstances. HPD Emergency Housing Services can be reached at 212-863-7660.
Can an Owner Appeal an OATH Decision?
A respondent may appeal under OATH's procedural rules. Generally, OATH must receive an appeal within 30 days of the decision, or 35 days if mailed, subject to applicable requirements and exceptions. An appeal does not itself legalize the unit or replace DOB correction obligations.
6. What Should Be Resolved before Further Rental Use?
Owners and buyers should reconcile actual unit count, occupancy records, leases, and open violations before relying on rental income. Tenants should preserve their lease, listing, payment records, and notices. A real estate attorney in Queens can evaluate disputed occupancy rights, corrective work obligations, and related proceedings.
23 Oct, 2026
