Aby Rosen is ratcheting up his fight with SL Green. Rosen’s RFR in December bought a $1 million apartment in the residential condo building at 5 East 44th Street. What would Rosen — who basks in a lavish lifestyle of high-end art and a private yacht — want with such a modest home? As it turns out, the condo’s board was negotiating to sell its unused air rights to Marc Holliday’s SL Green — which has been the subject of Rosen’s scorn ever since the REIT outmaneuvered him last year to buy the prime office development site at 346 Madison […]

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