The national vacancy rate is so high , why don't they gain some additional rental by renting?It seems that it doesn't prevent the sale of housing.

全国的空房率这么高，为什么他们不出租赚一些额外的租金，似乎这样并不妨碍房屋的出售。

youdao

The National Low Income Housing Coalition estimates that 10, 000 low-income rental units are lost every year to demolition, sale or natural disasters.

WSJ: A Texas-Size Housing Fight

According to the National Low Income Housing Coalition, there is a shortage of 3.1m low-cost rental units.

ECONOMIST: A national plan to end a national disgrace