– 9 0 ), ▁at ▁ 2 7 5 ▁Main ▁Street , ▁whose ▁construction ▁method ▁is ▁significant ▁in ▁that ▁the ▁building ▁consists ▁of ▁a ▁single ▁exterior ▁wall ▁of ▁heavy ▁pl anks ▁over ▁tim bers , ▁with ▁no ▁hidden ▁spaces ▁or ▁h ollow ▁walls . ▁This ▁so - called ▁mill - built ▁construction ▁was ▁used ▁largely ▁for ▁fire ▁prevent ion . ▁It ▁was ▁built ▁by ▁George ▁Warren ▁Hamm ond . ▁Frederick ▁Law ▁Ol m sted , ▁who ▁designed ▁Central ▁Park ▁in ▁New ▁York , ▁designed ▁the ▁landscape ▁for ▁the ▁exterior . ▁ ▁A ▁" gr ass ho pper ▁pl ague " ▁arrived ▁in ▁ 1 8 2 2 , ▁which ▁resulted ▁in ▁the ▁loss ▁of ▁whe at ▁and ▁corn ▁cro ps . ▁ ▁Ar ound ▁ 1 8 4 7 , ▁the ▁Old ▁L edge ▁School ▁was ▁moved ▁from ▁Gil man ▁Road ▁to ▁today ' s ▁Route ▁ 8 8 , ▁at ▁the ▁foot ▁of ▁the ▁hill ▁where ▁the ▁West ▁Side ▁Tra il ▁cross es ▁the ▁road . ▁A ▁ 1 9 7 5 ▁rep lica ▁now ▁stands ▁just ▁beyond ▁the ▁brick ▁schools ▁on ▁West ▁Main ▁Street . ▁ ▁Sec ession ▁from ▁North ▁Y arm outh ▁Y arm outh ▁constit uted ▁the ▁eastern ▁part ▁of ▁North ▁Y arm outh ▁until ▁ 1 8 4 9 , ▁when ▁it ▁se ced ed ▁and ▁incorpor ated ▁as ▁an ▁independent ▁town . ▁The ▁split ▁occurred ▁due ▁to ▁b ick ering ▁between ▁the ▁in land , ▁far ming - based ▁cont ing ent ▁and ▁the ▁coast al ▁mar