The issue of converting offices to housing is water supply and drainage. Electricity is well supplied in modern offices. The reason luxury apartments make sense

The issue of converting offices to housing is water supply and drainage. Electricity is well supplied in modern offices. The reason luxury apartments make sense is because either the apartments are real big so there's less plumbing needed, or they're real expensive, which pays for the necessary plumbing. But there's another way around that - low-income SRO housing with the shared bathroom and kitchens where the existing ones are.