Architectural time capsule alert! Hitting the market for the first time ever is one of the 10 units in Gregory Ain's Avenel Housing Cooperative, built in 1947. The 1,114-square-foot residence features a versatile floor plan with sliding walls that, per the listing, "separate or unify spaces to the occupants' requirements offering one, two or three bedroom configurations." This particular unit is an end unit with a fireplace, "southwest exposure, private yard and patio, views and one-car garage plus surface parking." Asking price is $650,000, plus HOA dues of $400 per month.