An untouchable board and no standard to hold it to.

As of early 2026, at least 39 NYC condo and co-op buildings sit on Fannie Mae's "unavailable" list, the roster of projects whose units cannot get a conforming mortgage. Nationally, a CoreLogic analysis found the count of associations designated "Unavailable" rose 329% between May 2023 and March 2025. Every building on that list was, at some earlier point, a building whose owners had no legal way to force the board to fix the problem, and no state standard defining what "fixed" would even mean. Those two absences are not separate failures. They are the same design, and the mortgage market is where the bill for it comes due.

The rule that puts board finances beyond review.

In Levandusky v. One Fifth Avenue Apartment Corp., 75 N.Y.2d 530 (1990), the Court of Appeals adopted the business judgment rule as the standard courts use to review the decisions of a residential cooperative board. Under that rule, a court will not examine the wisdom or soundness of a board's decision. Its inquiry is limited to whether the board acted within the scope of its authority and in good faith to further a legitimate purpose of the corporation. Absent a showing of fraud, self-dealing, or unconscionability, the review stops there.

The rule was quickly extended from co-ops to condominiums. In Schoninger v. Yardarm Beach Homeowners' Assn., 134 A.D.2d 1 (2d Dep't 1987), and later in the Court of Appeals' decision in 40 West 67th Street v. Pullman, 100 N.Y.2d 147 (2003), New York courts confirmed that a condominium board of managers receives the same deference. The practical effect is the same in both forms of ownership: how much a board sets aside in reserves, whether it funds a capital plan, whether it defers a repair another year, and how it prices common charges are treated as business decisions. A unit owner who believes the board is under-funding the building to the point of danger generally cannot get a court to substitute its judgment for the board's. The owner has to clear the narrow bar of bad faith or self-dealing, which a board that is merely imprudent does not meet.

The rule has a defensible core. Boards are volunteers, and a regime that let any dissatisfied owner relitigate every budget line would make service impossible. The exception matters too: where a board acts in bad faith or refuses the transparency the law requires, the rule does not shield it, which is the ground on which owners have won access to books and records. We traced the outer edge of that enforcement in the AG rent-stabilization post. But the core and the exception together leave a wide middle zone: ordinary, non-fraudulent financial neglect. In that zone, the rule does exactly what it was built to do, which is stop the second-guessing. When the decision being second-guessed is a decade of under-reserving, stopping the second-guessing is the problem.

The standard that does not exist.

A rule against second-guessing is only half of the structure. The other half is that New York never wrote down what a board is supposed to be doing in the first place. Cooperative Corporations Law §72 requires co-ops to keep "reasonable" reserves. It does not define reasonable, set a floor, or require any calculation. Real Property Law Article 9-B, the Condominium Act, is more bare still: no reserve requirement, no funding plan, no periodic financial filing with any state agency. There is no standardized reserve study, no standardized budget format, and no standardized disclosure a buyer can compare across buildings.

Put the two halves together. The business judgment rule says a court will not review whether a board's financial decision was sound. The statutes decline to say what "sound" is. So there is no benchmark against which a board could be found unsound even if a court were willing to look. An owner watching reserves drain toward zero is left with a board that is presumptively acting within its judgment, measured against a standard the legislature never wrote. New Jersey and Florida closed exactly this gap after the 2021 Surfside collapse by mandating credentialed reserve studies on a fixed horizon, filed with the state. New York's companion bills stalled in committee, as documented in the New Jersey reserve-study comparison and the Florida HB 913 post. The absence in New York is not a philosophy of light regulation. It is a specific missing piece next to a rule that assumes the piece is there.

Co-ops carry a second default vector.

For co-ops, the exposure runs deeper, because a co-op corporation typically carries an underlying blanket mortgage on the entire building. The corporation, not the individual shareholder, is the borrower. Each shareholder's own share loan sits junior to that building-wide debt. When a co-op has under-reserved for years and then faces a large, unavoidable capital cost, a ground-lease reset, or a refinancing of the blanket mortgage into a higher-rate market, the strain lands on the corporation first and every shareholder second. A building that cannot refinance its underlying mortgage on workable terms is a building-level solvency event, not a single owner's problem.

Standardization is thinner here, not thicker. Fannie Mae's reserve requirement, the one now forcing condos toward a documented capital plan, applies only to condos, not to co-ops. Lenders in the co-op space, such as the National Cooperative Bank, apply their own internal reserve ratios as a stability check, but that is a private underwriting choice, not a public standard an owner or buyer can rely on. So the ownership form with the extra layer of shared debt is also the form with the least external discipline. The business judgment rule applies to it in full, the state standard is absent, and even the market's proxy standard reaches it only indirectly.

How hidden fragility becomes a default.

Financial fragility built this way is invisible until something forces it into the open. Nothing internal to New York law forces it. So the first actor to price it is the secondary mortgage market, and it does so all at once. Fannie Mae's ineligible-projects rules and its post-Surfside project standards, which Fannie made permanent because, in its words, it was protecting borrowers from "physically unsafe or financially unstable projects, which could translate to significant spikes in homeownership costs" (The Future of Condo Lending), turn under-reserving and deferred repair into a hard eligibility line. The share of projects flagged has climbed from 1.2% in June 2023 toward the mid-single digits by 2025.

When a building crosses that line, conventional financing disappears for every unit at once, not just the unit that triggered the review. We laid out that mechanism in the August 3 full-review post. The chain from there is short and self-reinforcing:

• Buyers lose access to conforming mortgages, so the market for units narrows to cash purchasers, which compresses sale prices.
• Existing owners cannot refinance out of an adjustable or maturing loan, because the building itself is now ineligible collateral.
• The deferred capital work still has to be done, so the board levies a special assessment, often with limited notice.
• Owners already stretched by a falling-value, hard-to-sell unit fall behind on common charges.
• Once units 60 or more days delinquent pass 15% of the building, the project fails the delinquency test independently, which locks the financing shutdown in place.

Each step makes the next more likely. National mortgage delinquency has hovered near historic lows, around 3% in some stage of delinquency in recent CoreLogic reporting, which is exactly why a building-specific spiral is easy to miss in the aggregate. The average is calm while individual buildings, invisible until they cross the line, are anything but. There is no New York study measuring how many owner defaults trace to board financial decisions the business judgment rule placed beyond review, and this post does not claim one. The point is structural: the rule removes the internal legal correction, no state standard supplies an external one, and so the correction that does arrive comes from the mortgage market, late and concentrated.

The valuation channel: when values fall, the exits close.

The spiral above assumes an owner cannot simply sell or refinance out of a fragile building. It is worth being precise about that assumption, because citywide the market is not falling. Manhattan's median rent hit a record $5,000 in February 2026 (Brick Underground), and in the second quarter of 2026 the Manhattan median co-op sale price rose about 8.5% year over year to roughly $895,000, with condos up about 2.9% (The Real Deal, on Miller Samuel and Douglas Elliman data). The only softening visible is at the margin, in rental concessions, which climbed to roughly 21% of Manhattan listings and 26% in Brooklyn.

A rising citywide market does not protect an individual building once it lands on the ineligible list, because the financing shutdown manufactures its own local price decline. When conforming mortgages disappear, the buyer pool narrows to cash, and cash buyers discount for it, so a unit in an ineligible building can trade well below comparable units a block away even while the borough index climbs. Owners who are suddenly underwater against that building-specific discount have the least reason to keep funding a special assessment, so delinquency rises toward the 15% line. This is the precise version of the deflation worry, and it is the more dangerous one: not that a falling market drags a sound building down, but that the governance and standardization gap lets a single building's value fall out from under its owners while the market around it is still rising. A broad downturn would only widen the trapdoor.

Why "no standardization" is the more expensive choice.

Standardization is usually argued against as cost: another mandate, another filing, another vendor. But the alternative to a standard is not the absence of cost. It is a deferred, concentrated cost that arrives as a default event instead of a line in a budget. A mandated 30-year reserve study spreads a building's known capital needs across three decades of funding, which is precisely how a serious risk is made survivable. No standard does not remove that cost. It hides it, lets it compound, and delivers it as a special assessment and a financing shutdown in the same year.

The same logic applies to the business judgment rule. The rule does not eliminate financial discipline; it relocates who imposes it and when. With no owner able to compel prudence and no statute defining it, the discipline is imposed later, by an underwriter in Washington applying Fannie Mae's standard rather than by New York applying its own. That is the meaning of Fannie moving on reserves while four sessions of New York reform bills did not: the market is now enforcing the reserve adequacy the state declined to define. It is enforcing it on the harshest possible schedule, against buildings that can least afford the timing, and with a blast radius that covers every owner in the building rather than the board that made the decisions.

Bottom line.

A New York board's financial decisions are shielded from owner challenge by the business judgment rule, and no state law defines the standard those decisions should meet. The combination does not make buildings safer or cheaper to run. It defers the reckoning to the one actor that will eventually price the risk, the mortgage market, whose correction is abrupt, building-wide, and timed to arrive when a building is already weakest. Co-ops, carrying an underlying blanket mortgage and sitting outside even Fannie Mae's condo reserve rule, are the most exposed of all. New Jersey and Florida show the missing standard is drafable and administrable across a comparable housing stock. Until New York writes one, the discipline it declined to impose will keep being imposed for it, later and at higher cost, on the owners in its 15,108 condo and co-op buildings.

Primary sources:
Levandusky v. One Fifth Avenue Apartment Corp., 75 N.Y.2d 530 (1990) • Schoninger v. Yardarm Beach Homeowners' Assn., 134 A.D.2d 1 (2d Dep't 1987) • 40 West 67th Street v. Pullman, 100 N.Y.2d 147 (2003) • NY Cooperative Corporations Law §72 • NY Real Property Law Article 9-B • Fannie Mae Selling Guide B4-2.1-03 (Ineligible Projects) • Fannie Mae, The Future of Condo Lending • Brick Underground: Fannie Mae unavailable co-op/condo list (NYC) • CoreLogic / HousingWire: US mortgage delinquency • Brick Underground: NYC rental market report, February 2026 • The Real Deal: Manhattan co-op prices, Q2 2026

Companion resources: Every NYC condo loan goes to full review on August 3 • New Jersey mandated reserve studies. New York still hasn't. • Florida fixed condo transparency after Surfside. New York hasn't. • Your home is not an investment • What the AG's first RS lawsuits reveal about the governance gap • The 15,108-building NYC condo + co-op universe