He holds the record for a 715-pound bench press, but badass powerlifter Scot Mendelson hasn't been pulling his own weight -- at least according to his landlord, who claims Scot owes him over $25,000.
According to the lawsuit, filed recently in L.A. County Superior Court, Scot rented out space for a gym in L.A. last year -- called Xert -- but failed to pay portions of the rent from January 2011 to June, including taxes and fees ... totaling $25,651.07.
Scot's landlord claims he gave the muscleman 3 days notice last month -- to pay up or get the hell out -- but Scot hasn't budged ... and STILL owes the full sum.
Now, the landlord claims Scot's unlawfully squatting on the property -- and he wants him to pay the piper, stat ... plus $325 for each day Scot continues to occupy the property.
UPDATE: A rep for Mendelson tells TMZ he forked over $4,000 for June's rent and that he and the landlord worked out a deal -- if Mendelson moves out by the end of the month, the landlord will drop the suit.