It's actually one of the big problems with Capital in the 21st century: if you strip out housing, r < g! Turns out it's all zoning and rent control all the way down! Fix zoning and you end up incidentally fixing inequality too because it's such a large part of economic rents.
if it's all because of zoning, then how come we built more housing in the period leading up to the great recession (with the strict zoning laws that already existed)?