At least in my area, 55+ housing is the only multifamily housing that gets approved for building, because it adds to the tax base without adding students to the school district.
Also, in one rather hilarious instance, a gigantic 55+ development is going up on... land that is too toxic to allow children to live on, because it was a mechanical gauge factory before WWII, and the ground is saturated with unremediated mercury and other toxins.
Yeah, I lived like a block from the Brooklyn Army Terminal for ten years, moved away when my daughter was 9 months old, and I regularly hope I don't get super- cancer from it.
Everything property- value related here is based on school district performance and where the local high school falls in the USNews rankings, and increasing revenue through additional property taxes while not adding the expense of extra students makes 55+ communities super- attractive.