GREENWICH – The owner of a posh 6,192-square-foot Greenwich Avenue retail and apartment property sitting in the heart of the town is seeking an investor in what is known as a fee interest sale, according to the exclusive advisor Cushman & Wakefield. Winter HPG 171 Greenwich Ave. LLC is selling a 100% fee interest in 171-173 Greenwich Ave. A fee interest sale is the sale of a property where the seller conveys their full, absolute ownership interest (fee simple) to the buyer, often outlined in an agreement of purchase and sale. The term “fee” in this context refers to the owner’s highest and most complete form of real estate ownership, a “fee simple estate,” while “interest” denotes the specific ownership rights being transferred. The property last sold for $6.55 million in 2018, according to town property records. This population shift has reinvigorated the town’s retail and residential markets, creating robust demand, upward pressure on rents, and soaring property values.