Land records · Parcel maps · October 7, 2026
Co-op Proprietary Lease: How Co-op Ownership Works
What a co-op proprietary lease is: the lease giving a cooperative shareholder the right to occupy a unit, plus how co-op ownership differs from condos.
Co-op proprietary lease is the lease that gives a shareholder in a housing cooperative the right to occupy a specific apartment. In a co-op, a corporation owns the building, and buyers purchase shares in the corporation rather than real property. The shares come with a proprietary lease for a unit. Owners pay monthly maintenance charges covering the building’s mortgage, taxes, and operating costs. Co-ops are common in New York City and some other cities. Because shares are personal property, co-op transactions are documented differently from condo or house sales. This page is general land-records background, not legal advice.
Co-op vs condo
| Feature | Co-op | Condo |
|---|---|---|
| What you own | Shares and a lease | Real property unit |
| Document | Stock certificate and proprietary lease | Unit deed |
| Governance | Corporation and board | Association under declaration |
| Board approval | Often required for buyers | Usually not |
| Financing | Share loans | Mortgages |
| Taxes | Paid by co-op, passed through | Paid by unit owner |
Proprietary lease terms
- Unit identification.
- Maintenance charges.
- Use and occupancy rules.
- Subletting restrictions.
- Alteration approvals.
- Board powers and default remedies.
Board approval
Co-op boards often review buyers’ finances and may reject purchasers, within legal limits.
Records
Because co-op shares are personal property, transfers are not recorded like deeds. Lenders file UCC financing statements for share loans. In New York City, a cooperative index records these filings. Title searches for co-ops look at lien searches rather than a title commitment for the unit.
Building finances
The co-op’s underlying mortgage and finances affect maintenance charges. Buyers review financial statements.
Land leases
Some co-op buildings sit on ground leases, affecting long-term costs.
Example
A buyer purchases 500 shares in a cooperative corporation allocated to apartment 5C. They receive a stock certificate and sign a proprietary lease, after board approval. Their lender files a UCC financing statement against the shares.
Selling a co-op
Sales require board approval and may involve transfer fees, sometimes called flip taxes.
Tax deductions
Because the cooperative pays property taxes and the building mortgage interest, shareholders may be able to deduct their share of those costs under federal tax rules for cooperative housing, subject to limits. The co-op usually reports each shareholder’s share annually. Consult a tax professional for specifics.
Underlying mortgage and flip taxes
A co-op’s underlying mortgage is a debt of the corporation, and its terms affect maintenance charges. Many co-ops also charge a transfer fee, sometimes called a flip tax, paid by the seller at sale, which funds reserves.
House rules
In addition to the proprietary lease, co-ops adopt house rules covering renovations, move-ins, noise, and common areas. Buyers should review them along with the lease and bylaws.
Lease term
Proprietary leases often run for decades and renew automatically.
Bottom line
A co-op proprietary lease gives a shareholder the right to occupy a unit in a building owned by a cooperative corporation. Ownership is shares, not real property, with board approval and UCC filings instead of deeds. Review the lease and building finances before buying. Explore city records via the Platbookmapper map.
Co-op proprietary lease FAQ
What is a proprietary lease?
The lease giving a co-op shareholder the right to occupy a unit.
Do co-op owners own real property?
No, they own shares and a lease.
Are co-op transfers recorded?
Not as deeds; lenders file UCC statements.
Can a co-op board reject buyers?
Often, within legal limits.
What is a maintenance charge?
The monthly fee covering building costs.