a simple answer to your question לענ"ד, is, that during the height of post-covid until a couple of months ago, everyone that had access to a couple of dollars bought a house to catch the low mortgage rates and the housing hype, however it's only showing up now in the rental market that there's so many basements opening up as these markets are always lagging by a few months since there are leases expiring etc..
however now there's been a total standstill in the housing market as there are barely any sales as most people don't want to sell now for various reasons, such as they want to get the most $ possible, and they don't want to trade their 3% mortgage for 6.5% buying elsewhere etc. so this data should only show up in market in a few months, and since there's much less people moving and buying now it should push the market even higher in a few months...
the only new developments coming up are a a some on prospect, and a couple of projects on the 70 from imperial belz and vishnitz, some wont be ready for another while, but not enough to sustain the 1000 couples a year settling in lakewood.
די אייבישטער זאל געבען אסאך פרנסה פאר אלע אידישע קינדער