What both share is the dense overlay of NYC Local Laws: FISP façade inspections, Local Law 97 carbon caps, Local Law 126 parking-structure inspections, Local Law 152 gas-piping inspections, and the 2027 elevator secondary-brake mandate. For most NYC buyers, the Local Law compliance posture and the master insurance policy, read together against the building's age, tell you the most about future out-of-pocket exposure.
The Local Law compliance stack
FISP / Local Law 11 (façade, every five years, buildings over six stories), Local Law 97 (carbon caps tightening in 2030, $268/ton over the limit), Local Law 126 (parking structures, every six years), Local Law 152 (gas piping, every four years), and elevator modernization (secondary brake due January 1, 2027) overlap into large near-term capital programs. Request each status report and any associated assessment.
Co-op underlying mortgage and board approval
In a co-op you buy shares plus a proprietary lease, not real property. The building's underlying mortgage is a shared debt baked into monthly maintenance — confirm its balance, rate, and maturity, since a balloon refinance at higher rates drives maintenance up. Co-op boards can also approve or reject buyers without stating a reason, subject only to anti-discrimination law, which adds illiquidity and a board-approval contingency.
Hard insurance market and aging stock
NYC master policies face 20%+ premium increases, carrier pullback, and stricter underwriting; open DOB violations and water-damage history in aging prewar and postwar buildings can trigger non-renewal. Read the master declarations, deductibles, and any non-renewal notice, and confirm whether the building carries flood coverage given post-Sandy exposure.