Keith Sweat Sued For Foreclosed Home

PMI Mortgage filed the lawsuit against Sweat in Georgia -- claiming the singer defaulted on a $450,000 mortgage on his Detroit home, which he purchased in 2004.

Problem is -- the house was drowning underwater ... so when the bank sold it, it only recouped $200,000 ... a fraction of its losses.

PMI Mortgage sued Sweat for the balance -- $253,000 -- and since Keith failed to respond, a judge ruled in PMI's favor. PMI has since sought a lien on Keith's Georgia property in a last ditch effort to get its money.