A building manager was busted Tuesday for pocketing nearly $900,000 in rents paid at five upper Manhattan buildings by posing as the landlord, prosecutors said.

Luis Nunez, a married father of two, is charged with stealing $879,000, including monthly payments from Columbia University students living near the campus.

Prosecutors said Nunez, of the Bronx, spent the money enhancing his lifestyle.

"The defendant used the stolen money for furniture, jewelry, several vehicles, school tuition, etc.," Assistant District Attorney Om Gillett told a Manhattan judge.

Nunez, 42, was held on $50,000 bail after he pleaded not guilty to grand larceny charges, which could cost him seven years in prison.

The alleged 2005-to-2009 scam wasn't detected until Nunez started slacking off on duties unrelated to rent collections and the real landlords who were owed the money audited his work, officials said.

To evade detection, Nunez helped himself to rents from only some of the 100 apartments and fudged computer data aimed at tracking rents at 45Tiemann Place, 184-188 Claremont Ave. and 3139 Broadway, officials said.

The building owners were not available for comment.

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