▁been ▁other ▁renov ations ▁and ▁ ▁d eter ior ation ▁to ▁the ▁property ▁over ▁the ▁years . ▁ ▁The ▁last ▁property ▁in ▁the ▁district ▁is ▁the ▁dam . ▁It ▁is ▁made ▁of ▁locally ▁quar ried ▁stone ▁and ▁begins ▁ ▁east ▁of ▁the ▁mill , ▁following ▁a ▁natural ▁fall ▁line ▁at ▁the ▁north west ▁corner ▁of ▁the ▁district . ▁ ▁History ▁There ▁is ▁little , ▁if ▁any , ▁mention ▁of ▁the ▁mill , ▁bar n ▁or ▁farm house ▁in ▁early ▁histor ies ▁or ▁maps ▁of ▁the ▁G arrison ▁area . ▁Although ▁the ▁architect ural ▁styles ▁and ▁building ▁materials ▁strongly ▁suggest ▁a ▁mid - ▁to ▁late ▁ 1 8 th ▁century ▁construction ▁date , ▁similar ▁buildings ▁are ▁known ▁to ▁have ▁been ▁ere cted ▁in ▁the ▁Hudson ▁Valley ▁as ▁late ▁as ▁ 1 8 2 0 . ▁The ▁fr aming ▁system ▁of ▁the ▁farm house ▁is ▁more ▁commonly ▁found ▁in ▁the ▁lower ▁valley , ▁in ▁areas ▁closer ▁to ▁New ▁York ▁City ▁that ▁were ▁settled ▁earlier , ▁and ▁more ▁study ▁is ▁needed , ▁especially ▁given ▁the ▁high ▁integrity ▁of ▁the ▁structure . ▁ ▁The ▁earliest ▁land owner ▁known ▁to ▁have ▁developed ▁property ▁in ▁the ▁area ▁was ▁Jacob ▁Man dev ille , ▁a ▁New ▁York ▁City ▁business man ▁who ▁le ased ▁ ▁in ▁the ▁area ▁from ▁B ever ley ▁Robinson ▁in ▁ 1 7 3 5 ▁and ▁built ▁his ▁still - ext ant ▁home ▁just ▁outside ▁the ▁district . ▁It ▁is ▁possible ▁that ▁he ▁could ▁have ▁built ▁the ▁farm ▁and ▁mill ▁before ▁the ▁Revolution , ▁but ▁there ▁is