The “Bernie Madoff of landlords’’ is in debt up to his fanny over a Manhattan building made famous by “The Nanny,” a new lawsuit claims.

Embattled real-estate titan Steven Croman — who earned his dubious nickname over previous fraud and other charges — has defaulted on millions of dollars in loans tied to the Upper East Side site, which was used in the 1990s hit sitcom featuring Fran Drescher, according to Manhattan court filings.

The building at 7 E. 75th St. is now facing foreclosure thanks to the $8.22 million in outstanding debt he owes on it — bringing his total default claims on all of his properties to nearly $200 million, the lawsuit said.

That whopping figure allegedly includes $22.15 million he owes across a total of five properties alone in Manhattan.

In all, his shocking

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