When the lot is crowded, it can get tricky using the car. Cooperation and courtesy are required, and supplied, on both sides of the wall. Julio is a doctor, and his wife is a civil servant. Julio was born in the big house, before the extra rooms were added. He does not know exactly how long his family has lived here, although he believes that his mother's grandparents did not live here when his mother's mother was born.
Ownership is established by occupation.
Registration can be a complex procedure, often requiring the separate agreements of several neighbors. Inside places may or may not reflect the status of the buildings surrounding them. They pay their rent in US dollars. I am told that there are a great many such Inside places in Oaxaca. There is a diverse and rich social mix in Oaxaca, and it may not be apparent to the casual observer.