Douglas Elliman, who founded the eponymous brokerage in 1911, is sometimes credited with being the man who made uptown chic. So it stands to reason that he got in on the ground floor, commissioning a six-story Neo-Federal red brick townhouse from architect S.E. Gage in 1909. It also stands to reason that that townhouse has proved to be quite the solid real estate investment, selling—most recently—for $5 million in 1999 and $9.5 million in 2006. Now, 177 East 71st Street finds itself back on the market again, asking $18.25 million. The brokerage handling the sale is, of course … Brown Harris Stevens? Ouch. (Sotheby’s had the listing last time around.)