Here is an interesting news item, even though it lacks specifics:
The Associated Press: Fannie Mae to rent out homes instead foreclosing
We all have some kind of idea about today's foreclosure landscape. For comparison, during the Great Depression Baltimore's 71,070 "native white," 22,589 "foreign-born" and 3,793 black homeowners suffered 7,375 foreclosures. Additionally, the Home Owners' Loan Corporation, the federal government's bailout agency, intervened to save more than 10,300 owners from foreclosure.
The big difference was that there was no great "overhang" of foreclosed properties. Instead, they were rented in the still-expanding city as quickly as they were vacated. As a result, leners sold only 456 foreclosed homes in 1935-1936.
Baltimore had basically no residential vacancies before the Great Depression, during it or during WWII. The epidemic abandonment began only in the 1960s, when the city's population took a nosedive.