Sources say that a ballpark price per unit, due to other trade prices on the street could exceed $250,000 per unit, adding that the sale will benefit from the recent city council adoption of the Columbia University expansion, the continual improvement of the housing stock in the Manhattan Valley submarket, and the new the Upper West Side Rezoning Plan. With that comp price, it could fetch $96 million. A source close to the deal tells GlobeSt.com that they are not able to disclose who the seller is at this point, nor are they able to disclose reasons for selling.

"This portfolio reflects a rare combination of geographic concentration and upside in potential revenue," Gross says. "With average monthly rents priced at approximately $1,000, the new owner will be able to make additional capital improvements to the apartments--ownership has already spent $2.6 million to date on improvements--and accordingly increase rental rates as leases expire. The demand for these properties is steady, and there should be sufficient turnover for income growth."

Among the 384 apartments, there are four studio units, 32 one-bedrooms, 269 two- bedrooms, and 79 three-bedrooms. Two hundred fifty-two units are rent stabilized, 35 are designated senior citizen units, four are Section 8, 60 are rent controlled and 33 are destabilized.

According to Carillo, "the Upper West Side is one of the most sought-after neighborhoods in Manhattan. New construction abounds and is attracting an ever-widening up-market segment. Plus, a potential long-term investment strategy could be to convert some or all the buildings to condominiums in the future."