Rubric Capital, an investment management firm, signed a 5,800-SF lease at Marx Realty’s 10 Grand Central, securing the last of the pre-built suites at the building. Ownership is starting to attract companies to fill 25,000-SF of its Penthouse Collection on the 32nd-36th floors. Marx Realty has signed 184,000 square feet of new leases since announcing the building’s repositioning in mid-2018. Occupancy has increased from 78% to 95%. JLL’s Cynthia Wasserberger, Sam Seiler, David Kleiner and Carlee Palmer are handling the leasing for Marx Realty. Rubric Capital was represented by Cushman & Wakefield.