New York co-op law treats your apartment as shares of stock in a corporation, not as real property. You buy shares in the cooperative housing corporation that owns the building, and those shares come attached to a proprietary lease that gives you the right to occupy a specific unit. That single structural fact drives everything else: the board’s power to approve your buyer, the monthly maintenance you owe, the deductions you can claim on your federal return, the way a lender underwrites your loan, and the speed at which you can lose the apartment if you fall behind. The rules come from the New York Cooperative Corporations Law, the Business Corporation Law, the Martin Act, federal tax and fair housing statutes, and the co-op’s own bylaws, proprietary lease, and house rules.
Shares and the Proprietary Lease
You do not hold a deed. You hold a stock certificate and a proprietary lease, and the two are inseparable. Lose one and the other becomes meaningless.
The proprietary lease is not a standard rental. It runs for decades, is tied to your stock ownership, and spells out what you owe each month, what alterations you can make, whether and how you can sublet, and the circumstances under which the board can terminate your occupancy. Most of the day-to-day rules you live by come from this document and the house rules adopted under it, not directly from state statute. Before buying into any building, reading the proprietary lease cover to cover matters more than reading the offering plan, because the lease controls what you can actually do with the apartment.
Your Rights as a Shareholder
Voting
Shareholders elect the board of directors, vote on bylaw amendments, and approve large financial transactions. Your vote is typically weighted by the number of shares you hold, which usually tracks the size or value of your unit.
Access to Records
You have a statutory right to see certain corporate records. Under the Business Corporation Law, any shareholder who submits a written demand and waits at least five days can examine the minutes of shareholder meetings and the shareholder list during regular business hours, so long as the purpose is reasonably related to your interest as a shareholder.1New York State Senate. New York Business Corporation Law BSC 624 – Books and Records; Right of Inspection, Prima Facie Evidence Boards sometimes resist broader records requests, but the statute gives shareholders real leverage to see how their money is being spent.
What You Owe Every Month
Every co-op member pays a monthly maintenance charge that covers the building’s operating costs: staff, insurance, utilities, repairs, and the corporation’s own property tax bill. The board sets that number annually based on the operating budget. When an unexpected large expense hits, the board can also levy a special assessment on top of regular maintenance.
Falling behind is the fastest way to lose the apartment. The proprietary lease treats nonpayment as a default, and the co-op can move to terminate your lease and cancel your shares. Because you are a shareholder-tenant rather than a property owner, this process can be considerably quicker than a traditional mortgage foreclosure. Staying current is not optional.
Flip Taxes
Many New York co-ops charge a transfer fee, commonly called a flip tax, when shares change hands. It can be a flat dollar amount per unit, a percentage of the sale price (often one to two percent), a per-share fee, or a percentage of the seller’s profit. The money goes to the co-op’s reserve fund. Under New York law, a flip tax is enforceable only if it is authorized in the offering plan or the proprietary lease. A board cannot impose one by resolution alone. If your building charges one, the details will typically appear in the proprietary lease or an amendment to it.
Board Approval, Sublets, and Transfers
The feature that most sharply distinguishes co-ops from condos is the board’s authority over who lives in the building. When you sell, your buyer must submit a full application to the board, typically including financial statements, tax returns, employment verification, and personal references. The board can interview the applicant and vote to approve or deny.
Historically, co-op boards have not been required to state a reason for a rejection. The business judgment rule shields the decision so long as it was not made in bad faith or on a discriminatory basis. Recent legislative changes in New York City have imposed stricter timelines and procedural requirements on transfer approvals, but the board’s underlying authority to screen buyers remains intact.
Subletting is similarly controlled. Most proprietary leases require board approval to sublet, and many buildings layer on additional limits: a cap on how many units can be sublet at any time, a minimum period of owner-occupancy before you can sublet, or a maximum sublet length such as two years out of every five. Some co-ops prohibit subletting entirely. A sublet fee or surcharge payable to the building is common. If your plans might involve renting out the apartment, read the sublet provisions before you buy.
When a shareholder dies, the shares pass through the estate as personal property. Held in sole name, they go through probate, and the executor handles the transfer or sale. Held jointly with rights of survivorship, they pass automatically to the survivor, though the board still reviews the change. In either case, any new owner or buyer must clear the board’s application process. Heirs are not guaranteed approval, and delays of several months are common without advance estate planning.
What Limits the Board
Fiduciary Duty and the Business Judgment Rule
Directors owe fiduciary duties to the co-op and its members. Under the Business Corporation Law, each director must act in good faith and with the level of care that an ordinarily prudent person in the same position would use. Directors may rely in good faith on reports from officers, accountants, and legal counsel whom they reasonably believe to be competent. A director who meets this standard is not personally liable for board decisions.2New York State Senate. New York Business Corporation Law BSC 717 – Duty of Directors
Courts translate this into the business judgment rule as applied to co-op boards: they will not second-guess a board decision so long as the board acted in good faith, within its authority, and in furtherance of the co-op’s legitimate interests. The rule gives boards wide discretion, but not unlimited discretion. Bad faith, self-dealing, and discrimination fall outside its protection.
Objectionable Conduct and Eviction
The most serious consequence a shareholder can face is termination of the proprietary lease, which effectively means eviction and forced sale of shares. Many proprietary leases let the board terminate a shareholder’s occupancy for “objectionable conduct,” and few define what that phrase means. The New York Court of Appeals addressed this in 40 West 67th Street v. Pullman, holding that a board’s decision to terminate on objectionable-conduct grounds is reviewed under the business judgment rule. As long as the board acted in good faith, within its authority, and in furtherance of the co-op’s legitimate purposes, a court will not substitute its own judgment. That standard heavily favors the board, and an objectionable-conduct proceeding is difficult to challenge without evidence of bad faith, discrimination, or personal vendetta.
Fair Housing
Board power is meaningful precisely because it decides who lives in the building, which makes fair housing law especially important here. Federal law prohibits discrimination in any aspect of housing based on race, color, religion, sex, disability, familial status, or national origin, and that reaches the co-op application and interview process. Using different screening criteria, delaying an application, or imposing different terms because of a protected characteristic is illegal even if the board never states a discriminatory reason.3eCFR. Discriminatory Conduct Under the Fair Housing Act
New York State’s Human Rights Law goes further, adding protections based on age, marital status, military status, sexual orientation, gender identity or expression, lawful source of income, domestic violence victim status, citizenship or immigration status, and arrest records resolved in the complainant’s favor.4Homes and Community Renewal. Fair Housing Information The lawful source of income protection matters in the co-op context because it limits a board’s ability to reject applicants simply because their income comes from government assistance, a trust, or another nontraditional source.
Boards must also make reasonable accommodations for residents with disabilities. The most common example is assistance animals: even where the building has a no-pets policy, the board generally must allow a resident’s assistance animal when the resident has a disability-related need and has made a request supported by reliable information.5U.S. Department of Housing and Urban Development. Assistance Animals A board can refuse only in narrow circumstances, such as when the specific animal poses a direct safety threat that no other accommodation can address.
Tax Benefits
Federal Deduction Passed Through the Co-op
Because the co-op corporation pays property taxes and mortgage interest on the building, and because your maintenance funds those payments, the IRS lets qualifying shareholders claim their proportionate share of those costs as personal deductions.6Office of the Law Revision Counsel. 26 USC 216 – Deduction of Taxes, Interest, and Business Depreciation by Cooperative Housing Corporation Tenant-Stockholder
To qualify, the corporation must meet the IRS definition of a cooperative housing corporation: only one class of stock, each stockholder’s occupancy right flowing from stock ownership, and at least 80 percent of gross income coming from tenant-stockholders (or 80 percent of the building’s square footage residential, or 90 percent of expenditures benefiting tenant-stockholders).6Office of the Law Revision Counsel. 26 USC 216 – Deduction of Taxes, Interest, and Business Depreciation by Cooperative Housing Corporation Tenant-Stockholder Most residential co-ops in New York meet these tests easily.
Your deductible share is your shares divided by total shares outstanding, multiplied by the corporation’s deductible taxes and mortgage interest. The co-op typically provides this figure each year, and many issue a Form 1098. If you itemize, the pass-through amounts can meaningfully reduce your tax bill.7Internal Revenue Service. Tax Information for Homeowners
The NYC Co-op and Condo Abatement
Co-op buildings in New York City are assessed as a single property, so the corporation pays the tax bill and folds the cost into maintenance. New York City’s Cooperative and Condominium Property Tax Abatement reduces the effective burden for eligible units used as a primary residence. The percentage depends on the average assessed value of residential units in the building:8NYC Department of Finance. Cooperative and Condominium Property Tax Abatement
- $50,000 or less: 28.1% abatement
- $50,001 to $55,000: 25.2% abatement
- $55,001 to $60,000: 22.5% abatement
- $60,001 and above: 17.5% abatement
The board or its managing agent must apply for the abatement and renew it annually. The standard deadline is February 15 each year, though for the 2026–27 tax year the deadline was extended to February 23, 2026. Individual unit owners do not file directly; they certify to the board that the unit is their primary residence, and the board attests to residency on the application. Missing the deadline means the entire building loses the abatement for that tax year, with no exception process.8NYC Department of Finance. Cooperative and Condominium Property Tax Abatement
Financing a Co-op Purchase
Buying a co-op requires a share loan rather than a traditional mortgage, because you are purchasing stock rather than real property. Not all buildings qualify for conventional or government-backed financing.
For a share loan to be eligible for purchase by Fannie Mae, the building must meet detailed project standards. The corporation must hold clear title, the building must be at least 50 percent owner-occupied by principal-residence purchasers, and the financials must show adequate cash flow to cover debt and operating expenses. No more than 15 percent of shareholders can be more than 60 days late on their financial obligations to the co-op, and any negative cash flow in the current year cannot exceed 5 percent of the most recent audited financials.9Fannie Mae. Co-op Project Eligibility Buildings that fail these tests leave buyers with portfolio lenders, who often charge higher rates and require larger down payments.
FHA-insured co-op loans exist under Section 203(n) of the National Housing Act. The borrower must intend to occupy the unit, and failing to pay your share of common expenses counts as a default under the program.10eCFR. Part 203 – Single Family Mortgage Insurance In practice, many New York co-ops do not participate, so confirm a building’s eligibility early.
Whatever the loan type, expect lenders to scrutinize the co-op’s financials, reserve fund, and share of investor-owned units alongside your own credit and income. A building in poor financial health can sink your loan even when your personal file is strong.
Disputes with the Board
Disagreements between shareholders and the board usually involve maintenance charges, alteration requests, noise complaints, or claims that the board has exceeded its authority. Many co-op governing documents require or encourage mediation or arbitration before litigation. If your proprietary lease contains an arbitration clause, you may be contractually bound to use it before going to court.
The New York State Attorney General’s office enforces the Martin Act’s disclosure requirements. If a co-op fails to file or amend its offering plan properly, or if the plan contains material misrepresentations, shareholders can complain to the AG. Individual rights claims can also be pursued in court, where judges apply the business judgment rule to board decisions while still policing fraud and discrimination.