March 4, 2026
When buying a co-op or condo in NYC, due diligence, or the legal and financial review that happens after an offer is accepted but before a contract is signed, is one of the most important steps in the transaction. But what gets reviewed, and why, depends heavily on which property type is being purchased.
The reason comes down to a fundamental legal difference: co-op buyers purchase shares in a corporation, while condo buyers purchase real property. That distinction shapes everything about how due diligence is conducted for each.
Because co-op buyers are purchasing shares in a corporation rather than real property, the review focuses heavily on the financial health and governance of the building as a whole.
At minimum, an attorney will examine audited financial statements to determine whether the building is operating profitably and whether the reserve fund—the savings set aside for major repairs—is adequately funded. Thin reserves are one of the most reliable predictors of future special assessments, which can add significant unexpected costs for shareholders.
The building's underlying mortgage also warrants close attention. This is the loan the co-op corporation itself carries on the building. If that mortgage is maturing soon or carries a high balance relative to the building's finances, it can put pressure on the entire corporation and potentially trigger assessments or fee increases.
Board meeting minutes are another key document (often the most revealing). Minutes can surface pending repairs that haven't made it into the financials yet, ongoing disputes, management issues, or planned capital projects. The proprietary lease and bylaws govern everything from subletting rights to renovation rules to what board approval is required and when.
Co-op subletting rules deserve extra scrutiny. Some buildings restrict rentals to a limited number of years, require board approval for each tenant, or charge sublet fees that reduce rental income. A careful read of the proprietary lease before signing a contract can prevent a costly surprise after closing.
Finally, closing a co-op requires board approval, meaning the buyer must go through the building's application process before the transaction can be finalized.
Because condo buyers are purchasing actual real property, the process requires a title search. The title search verifies that ownership is clear and identifies any liens or encumbrances on the unit, such as unpaid debts or legal judgments that must be resolved before the property can transfer cleanly. Most lenders will also require title insurance to protect against any ownership claims that weren't caught in the search.
On the building side, the review covers common charge history, the health of the reserve fund, and any pending or past special assessments. The offering plan and house rules outline what owners can and cannot do, including rental policies, which matters significantly for investors. Unlike co-ops, condos generally do not require board approval to close, which makes the transaction timeline somewhat more predictable.
Both property types also require a review of open violations, permits, and Certificates of Occupancy. Open violations can hold up financing and title insurance, and are one of the most common issues that surfaces during the due diligence window.
Disclaimer: This content is meant for informational purposes only and is not intended to be construed as financial, tax, legal, or insurance advice.
