I recall a comment suggesting financing terms can be impacted once a drop in rental rate is realized. An apartment with an assumed rental value of $X can sit e

I recall a comment suggesting financing terms can be impacted once a drop in rental rate is realized. An apartment with an assumed rental value of $X can sit empty and still be assumed to pull $X. As soon as they start renting it out for $Y, the financials might have to be re-evaluated, which might prompt extra collateral from the borrower. I have no idea how reliable this comment may have been, but it's an idea...