Two multimedia tenants of SL Green Realty Corp., Pandora Media and IMG, are expanding their offices at 125 Park Ave. and 304 Park Ave. South, respectively.

Online music provider Pandora has doubled the size of its New York City office by 51,065 square feet at 125 Park Ave., reaching 103,515 square feet under a 10-year expansion lease. Pandora declined to elaborate on its growth.