It would be cool if this map went way before 1960. Where I live there’s a ton of 1700s, 1800s and early 1900s housing.

The adobe house I grew up in New Mexico had a 22 carved into one of the vigas, and we always thought it was 1922. But in the early-mid 80s two women came to the house. They were born there in 1908 and 1910. They said their father was born there too. They remembered the roof being completely replaced, and the 22 might have been part of that.