People love the "investors and billionaires are buying up the market" story because it suggests a convenient villain, when the truth is that the millions of ordinary Americans who oppose new housing in their neighborhoods are a much bigger factor. Of course, that's not as satisfying as blaming a Disney villain.
We've been under-building for decades. We have a massive shortfall of new units, far beyond the number of empty luxury apartments. Frankly, at this point I'd support a meaningless vacancy tax just so we could put this objection to bed and focus on things that matter.
https://www.cnbc.com/2021/12/09/new-york-city-rents-jump-22p...
One clear the example of the outsized impact is these buildings bought up air rights from multiple properties. So, they reduced the legally available space. When the city makes space for ~100,000 apartments and actually gets less than 1/10th that it’s a problem.
Another is the extreme cost of the associated tax breaks for affordable housing for minimal gain. The city set the tax break based on price while the number of affordable houses was based on the number of apartments. A seemingly obvious problem looking back, but still a problem for city residents.
See: https://www.millersamuel.com/files/2022/02/Feb22QNSrent-nyVA...
Another way of looking at 2% vacancy is over 20 years an apartment is vacant less than 5 months. People move, die, go to prison etc, so there is some inherent friction represented in a 98% occupancy rate. Dropping to 1% long term takes more than just higher demand it would require increases in transaction efficiency.
And a couple of tall buildings in manhattan isn't gonna be making any difference. The difference would come from building denser everywhere.
So even if 5 buildings out of 300 skyscrapers are at 50% occupancy on their own don’t matter much they still impact the market when combined with similar investments. Worse they prime the bubble by convincing more people to invest without putting them up for rent.