When I was house hunting, 4 bedroom condos in a city basically didn't exist. Most of the ones I saw were 5-10x the price of a suburban 4 bedroom home - and that's ignoring the HOA fee, which many single family residences don't have.
Cities discourage or outright prohibit anything beyond 2 bedroom MDUs being constructed. Its a great way to keep families from putting down roots in an area, or expanding much beyond 2 to 3 members.
Seattle isn't quite as bad as other cities in pushing this policy, but there isn't any extra push to incentivize construction of 3+ bedroom apartments & condos (eg: additional building height/width allowances).
IIRC our auditor wrote a report that came to the conclusion that we had way too few 3+ bedroom units in the city. If we want affordable housing (not "Affordable" housing, with heavy subsidies), set back & step back requirements need to be loosened for construction that includes valuable 3 & 4 bedroom condos and apartments.
Note: HOAs in Seattle proper are very rare outside of condos. Ditto outside the city limits, though some small single family home enclaves choose to kneecap themselves with a HOA.
