Those jobs can be remote, and it is cheaper to encourage employers economically to support remote work than to reshape entire geographies with housing.

Speaking of Manhattan:

https://www.nytimes.com/2021/07/01/nyregion/manhattan-vacant... (Office Vacancies Soar in New York, a Dire Sign for the City’s Recovery; Nearly 19 percent of all office space in Manhattan has no tenants — the highest on record — as companies shed leases and embrace remote work.)

https://www.bloomberg.com/news/articles/2020-12-05/even-befo... (Even Before Covid 2,600 People a Week Were Leaving New York City)