Steven Durels, senior vice president and director of leasing at SL Green notes that the REIT worked closely with both medical concerns to customize the spaces to help meet specific operating and technical requirements. "Healthcare organizations have very specific needs when it comes to choosing a landlord," says Durels. "Because their business impacts so many people's lives, healthcare providers need a landlord who can respond immediately to their needs, and who can provide services 24 hours a day, seven days a week."

New York Presbyterian has occupied the space at 673 First since 1994 housing its critical care monitoring, back office and billing functions on six floors. SL Green originally redeveloped the building and converted it from a distribution facility. Though leasing amounts were not revealed for either transaction, space One Park is advertised at between $30 and $40 per sf.

John Cefaly of Cushman & Wakefield and Michael Burgio of CB Richard Ellis represented New York Presbyterian Hospital in the transaction. NYU was self-represented in the transaction at One Park Ave.

The self-administered and self-managed REIT, which concentrates on sites in Manhattan, has been on a roll of late. The company recently inked a 10-year lease renewal with CBS Broadcasting Inc., which will remain in 188,583 sf at 555 West 57th St.