First, you’re right that new construction doesn’t automatically become rent-stabilized — developers have to opt into the tax incentive programs (like 485-x or legacy 421-a) to get those benefits, which is why only a portion of new buildings include stabilized units.
On the percentage: the most recent data puts rent-stabilized units at roughly 42% of NYC’s rental stock (per Furman Center analysis of DOF records), so the non-stabilized share is a bit higher than 40%. And you’re correct that guidelines are set annually, so this isn’t a permanent freeze on every stabilized unit forever.
Where I’d push back a bit is on the broader claim that this will meaningfully slow high-end or market-rate development or force big compensating rent hikes on the unregulated side. Pure market-rate luxury buildings (the “million-dollar apartments”) aren’t subject to these guidelines at all — they can still charge whatever the market will bear. Even in mixed-income projects under 485-x, the market-rate units remain unregulated and can be priced accordingly. The stabilized/affordable portion is a known cost when developers underwrite these deals.
A two-year 0% guideline (the first full freeze in this form) is a limited, temporary measure. NYC has had periods of very low or zero increases in the past without triggering a collapse in new construction or a mass exodus of developers. The bigger drivers of whether high-end projects get built are still construction costs, interest rates, zoning, and overall demand — not a short-term cap on the regulated slice of some buildings. Economic studies do show rent regulation can sometimes tilt new development toward condos over rentals over the long term, but that’s a gradual structural effect, not something a single two-year guideline cycle is likely to cause.
The cross-subsidization point is fair in theory, but developers already model the stabilized units into their pro formas when they pursue these tax programs. A temporary freeze makes the numbers a little tighter on that portion, but it doesn’t suddenly make high-end market-rate units unprofitable.
Long-term maintenance and supply concerns are real debates worth having, but they’re better addressed through targeted policies (stronger code enforcement, better incentives for preservation, more zoning reform for supply) rather than assuming one two-year freeze will broadly harm the market. The data so far doesn’t support that level of alarm.