Casey Johnson's estate now has a $200,000 problem on its hands -- which is a problem because the estate is only worth $75,000.
According to the claim -- filed by Jose Luis Nazar in L.A. County Superior Court -- the Johnson & Johnson heiress signed a lease for a swanky $16,000 a month pad back in November of 2008.
In the docs, Nazar claims Casey not only failed to pay over $90,000 in rent, she also left the place in ruins, with damages totaling $102,760 in damages.
Among the repair costs:
-- Garden Restoration and Maintenance -- $22,635
-- Pool, Spa and Equipment Restoration and Maintenance -- $10,045
-- Interior Flooring Restoration -- $9,693
-- Electrical Repair and Restoration -- $7,876
As we previously reported, Casey died from a severe insulin deficiency back in January.