Supply is supply. Unless they are tearing down older units, new expensive apartments should make the older, less trendy units cheaper.
Supply is supply, and there's only so much real estate in NYC.
Buisness dump invested money into expensive building. If no one rents then it stays vacant. Why vacant, isnt the landlord going to lose money? well yes but if he rents a lower amount then his valuation goes down and he is suddenly upside down on his loan. So he is compelled to not rent versus renting it.
Add to this governments make more tax yearly if its valued hire and now there is no incentive to fix this.
More about the tax: https://www2.gov.bc.ca/gov/content/taxes/speculation-vacancy...
https://vancouversun.com/business/real-estate/three-years-in...