Nearly impossible, and definitely prohibitively expensive in any top tier city. Zuck got a lot of pushback and significant difficulty when buying a couple of adjacent lots in Palo Alto.
We seem to be doing life backward: We live alone and expend effort to gather together, as if that’s the healthy baseline
The alternative is staying in some backwater place just because one of your friends is there, and you have absolutely nothing to do there except hang out with that friend, while being constantly frustrated with all the other aspects of life in that place.
My point here is that what matters to a given person is pretty subjective, and, personally, I'd never live in Seattle again if I could help it -- and this is from someone who grew up just 90 miles north in Bellingham. (I'd live in Bellingham again.)
But this is anec-data, with n=1