Yeah, I live in Falls Church, which has seen more build-up than other areas in Northern Virginia because the city has never had the kind of restrictive zoning that the anti-"Missing Middle" campaign is
still fighting in Arlington. The value of my single-family home peaked in 2024 and has dropped slightly since. To my understanding, this is generally true of my zip code and not true of comparable zip codes in the area.
But Falls Church is much nicer now that a few mid-rise apartment buildings with ground-level retail have gone in! As a resident, I am very happy about all the new development. I expect that over time, that will have a positive effect on property values, but there is an observable short- and medium-term effect working in the opposite direction as the increased housing supply eases demand on the existing housing stock.