They mostly were not used as living quarters, except cases of emergency. Its not like they rented out office space like in downtown Manhattan. Also no factori

They mostly were not used as living quarters, except cases of emergency. Its not like they rented out office space like in downtown Manhattan. Also no factories that required thousands of workers. So I'm not sure the modern analogy of square footage applies. They fell out of favor by the 16th century. Coincidentally about the same time as cannon starting being very effective.