NEW YORK CITY — SL Green Realty Corp. has partnered with RXR Realty to acquire a 48.7 percent interest in Worldwide Plaza, a Class A mixed-use property in Midtown Manhattan. New York REIT is selling the interest and will continue to own the remaining equity with WWP Sponsor, its existing partner. Slated to close in the fourth quarter, the transaction values the asset at $1.7 billion. Developed in 1989, Worldwide Plaza consists of a 49-story, 1.8 million-square-foot office tower, a 252,000-square-foot retail building with parking garage and a large open-air plaza. Tenants at the office tower include Nomura Holdings, Cravath Swaine and Moore LLP, WebMD, WNet.org, Rubenstein and CBS Broadcasting. The retail building features a five-stage off-Broadway theater, a 475-space parking garage and TMPL, a state-of-the-art fitness gym. At the time of sale, the property was 100 percent leased.