> What better giant finger to that neighbor than selling your multi-acre estate to be replaced by a 30 or 100-unit apartment complex?
You really do not realize how big (or small, rather) apartment complexes are. 100-unit building is the size of 6-7 single family homes (or maybe 3 McMansions), and maybe twice as high. It would barely be noticeable in such neighborhood.
See this for example: https://ctexaminer.com/2021/10/23/100-unit-apartment-complex...