They’re breaking out the champagne — and 24-layer chocolate cake — at SL Green’s 1185 Sixth Ave. between West 46th and 47th streets.

A deal with Moroccanoil, a luxury and body-care company, broke the 90% leased mark at the tower, where 91.5 % of its 1.1 million square feet are now committed, up from 85% in January. The 10-year deal covers 39,799 square feet on the entire 33rd floor and part of the 32nd floor.

At the same time, Carnegie Diner opened on the ground floor after a Con Ed delay. The cafe and sister eatery Delos, a Greek restaurant, take up the tower’s teeming 47th Street corner. Delos is due to open next month.

Carnegie Diner recently opened on the ground floor at 1185 Sixth Ave. after a Con Ed delay. mentistudio.com

Moroccanoil will move from 135 E. 57th Street which is be

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