A co-op board has rejected a prospective buyer's mother-in-law and offered no explanation — a outcome that feels outrageous, is entirely legal, and has been the operating norm in New York City cooperative housing for decades. The frustrated buyer, whose situation was reported by Curbed, is now seeking advice on how to extract answers from an institution that is under no obligation to provide them.

That is not a flaw in the system. It is the system. New York co-ops operate as private corporations whose shareholder-members have broad authority to approve or reject applicants for proprietary leases. Courts have consistently held that boards need not disclose their reasoning, provided the decision does not violate the Fair Housing Act or the New York City Human Rights Law, which prohibit rejection on the basis of race, religion, national origin, disability, familial status, and several other protected categories.

Housing attorneys and real estate professionals who have commented publicly on similar cases note that the most common undisclosed reasons for rejection include insufficient liquid assets after closing, debt-to-income ratios that fall outside board guidelines, concerns raised during the interview itself, and opposition from existing shareholders. None of these need to be stated. The letter arrives, the deal dies, the board moves on.

For applicants who believe discrimination was a factor, the New York City Commission on Human Rights accepts complaints and has investigative authority. Discrimination cases are difficult to prove without a stated reason, which is, attorneys note with some weariness, the point.

The mother-in-law's application is closed. The board has said all it intends to say, which is nothing. The advice column will offer tips. The tips will not change the outcome.

I filed the full legal framework on this one. The co-op board will not be reading it, but then again, neither will anyone else.