Hello and welcome,
Power Spots do not follow the same criteria and guidelines as Wayspots, as many have been imported from a 3rd party database, while others are unused Wayspots. I don’t think the Power Spot for an apartment building will be removed if it was an import, as there are apartment buildings in my neighborhood that get Power Spots from time to time.
More info on Power Spots can be found here: Clarifications on Pokémon Go Power Spots [Discussion]