REAL ESTATE

Group to Lower Its Bid for Rockefeller Center: The group that includes David Rockefeller and the Goldman, Sachs & Co. investment firm had proposed buying the center’s bankrupt mortgage holder, Rockefeller Center Properties Inc., for $7.75 a share, or $297 million, less than two weeks ago. But the investors said in a letter Tuesday to Rockefeller Center Properties that they had been made aware of additional liabilities. The group did not suggest a new price, just that it would need to meet with Rockefeller Center Properties and that it would extend its offer until Monday. Meanwhile, the investment fund Gotham Partners L.P., which owns 5.55% of the mortgage holder, said other shareholders owning about 18% support its proposal for the landmark New York complex. Gotham has made an offer that would leave shareholders in full control. The other active bidder, a group led by Chicago investor Sam Zell, remained quiet Tuesday.