In recent years, Anoka's Housing Redevelopment Authority used plummeting real estate prices to buy and raze six older, deteriorating homes in the city and rebuild on the lots.
Now that the housing market is improving, the program is over. Still, it has stirred debate about what's worth saving.
"We at the HRA tried to look at the glass half full. We needed to take advantage of this unfortunate opportunity where values were so bad," HRA chairman Carl Youngquist said. "We knocked down those homes and tried to improve the neighborhood, getting rid of blight. In my opinion, it was an improvement. We had neighbors thank us."
How do communities decide what is worth preserving?
The National Register of Historic Places lays out standards for determining whether a building or structure is eligible for being listed, said Denis Gardner, National Register historian with Minnesota's State Historic Preservation Office.
They include evaluating a structure's historical importance: Did a significant event occur there? Did a significant person live there? Is the design significant?
It's also about gauging a building's historic physical integrity. How original is the building?
Even if a home or building doesn't rise to the level of the Historic Register, it can still be worth saving, Gardner said. Often, it comes down to community values.