Owner's Auction on property in Elwyn Park, Portsmouth, NH. Online-only bidding ends on Wednesday, October 18th at 7:00 p.m. The list price is the current assessed value as required by NNEREN. 14 Van Buren Avenue is a 3 bedroom Ranch style home that totals 1,144Â± sq.ft. with hardwood floors throughout. The home includes a full basement, attached 1 car garage, wood burning fireplace and sits on a .20Â± acre lot. Tax Map 250, Block 113. This property is located in the desirable Elwyn Park neighborhood and is steps from the Dondero School.