On March 3, 2020, the D.C. Policy Center’s article, Single-family zoning and neighborhood characteristics in the District of Columbia, was cited by WAMU:
In the D.C. region, vast swaths of residential areas are zoned exclusively for single-family homes, the most space-intensive and costly form of housing. For example, almost 90% of residential land in Arlington County is reserved for detached single-family homes. In D.C., it’s 36%. (The percentage is much higher if you include D.C.’s many rowhouse neighborhoods.)
Read more: ‘Luxury’ Amenities Aren’t Why Housing Is So Expensive In The D.C. Area | WAMU