Cross-dressing killer Robert Durst could be some lucky New Yorkers’ new landlord.

Booted years ago from his family’s vast real-estate empire, the creepy property heir has quietly been building a new one, shelling out $12.3 million from his $43 million trust fund to buy rental properties in Brooklyn and Manhattan, court papers reveal.

Since late 2011, Durst, 70, has bought an apartment building in Cobble Hill, two in Williamsburg and two in East Harlem, according to the filing.

He is a longtime suspect in the unsolved 1982 disappearance of his first wife, Kathleen.

In 2002, Durst was arrested in Galveston, Texas — where he’d been living as a woman under a fake name — for shooting his neighbor in the face and chopping up his body.

He was acquitted of murder by jurors who believed it was self-defense.