Lehman Brothers Holdings Inc. has agreed to sell 237 Park Avenue, a 21-story Midtown Manhattan office building, to RXR Realty and Walton Street Capital LLC, the winning bidders said on Tuesday, Reuters reported. The purchase price is $820 million, two sources familiar with deal said. The pending sale comes just months after Lehman agreed to sell its biggest property holding, apartment owner Archstone, to AvalonBay Communities Inc and Equity Residential for $6.5
