Those are some crazy numbers. I could build a garage apartment for a bit over 100k in Milwaukee. I could divide my house into 2 units with a few walls and elect

Those are some crazy numbers. I could build a garage apartment for a bit over 100k in Milwaukee. I could divide my house into 2 units with a few walls and electrical work. Lots of houses have unused or underused attic/garage/conditioned space that can be converted relatively cheaply. My "fully built out" neighborhood has plenty of tear-downs, houses on double or triple lots, and even a few truly vacant lots. This is not going to double the density of neighborhoods, but it opens options for residents and makes it much easier to add units. Sometimes that won't be worth it economically - even if you want to - but the numbers will work out in many cases.