After the Buildings Department shut down semi-secret subterranean restaurant/tequila lounge La Esquina for "conditions imminently perilous to life," the trendy hotspot has been mysteriously permitted to reopen permanently. The big question now is how Barnard professor and NIMBY nightlife scold Georgette Fleischer will react. She's the one whose 311 calls got the DOB to investigate, and one of her students tells Page Six she's a real loose cannon: "She would have ridiculous mood swings before and after class... She'd constantly create issues for students to get them in trouble. She was like a narc." Another source reveals what may be her Achilles heel: "She once yelled at me in class because I said I had a good relationship with my dad but not with my mom. But she loved cats."