Vornado Realty Trust is “nervously bullish” on the city’s commercial real estate market, Steven Roth, the REIT’s chairman, told CNBC’s Squawk Box today. Roth said that while he believes the market bottom has already passed, and transaction volume is “ticking up a great deal,” he is still keeping some office space in his portfolio off the market until rents recover. Meanwhile, Richard LeFrak of the LeFrak Organization noted that the commercial leasing landscape has morphed over the past decade to accommodate the growth of large hedge funds.