REAL ESTATE

Rockefeller Center Offer Sweetened: Goldman, Sachs & Co. has offered to return a $33.7-million debt payment it received earlier this month from Rockefeller Center Properties Inc., the holder of the $1.3-billion mortgage on the New York City landmark. The offer, disclosed in a Securities and Exchange Commission filing, is designed to entice Rockefeller Center Properties to accept a reorganization plan offered by the investment bank and reject a competing plan by a group of investors led by Chicago financier Sam Zell and including Walt Disney Co. Goldman said its offer is contingent on Rockefeller Center Properties’ abandoning an agreement it signed with the Zell group last week.