ver . ▁He ▁designed ▁the ▁Fer g us on ▁House , ▁which ▁was ▁completed ▁in ▁ 1 8 9 9 . ▁Following ▁his ▁father ' s ▁death ▁in ▁ 1 8 9 5 ▁and ▁his ▁brothers ' s ▁death ▁in ▁November ▁ 1 8 9 8 , ▁Bo al ▁returned ▁to ▁the ▁family ' s ▁Bo al ▁M ansion ▁in ▁Bo als burg , ▁Pennsylvania . ▁He ▁made ▁major ▁style ▁changes ▁and ▁add itions ▁from ▁ 1 8 9 8 ▁through ▁ 1 9 0 5 . ▁ ▁Bo al ▁partner ed ▁with ▁Frederick ▁Louis ▁Har no is , ▁Bo al ▁and ▁Har no is , ▁which ▁was ▁active ▁from ▁about ▁ 1 9 0 0 ▁to ▁ 1 9 0 7 . ▁Between ▁ 1 8 9 9 ▁and ▁ 1 9 0 2 , ▁Bo al ▁designed ▁the ▁ 4 2 - room ▁Red stone ▁Castle ▁in ▁Red stone , ▁Colorado . ▁Bo al ▁& ▁Har no is ▁design ▁C raw ford ▁Hill ▁M ansion ▁and ▁the ▁Grant – H umph re ys ▁M ansion . ▁During ▁that ▁time , ▁Bo al ▁lived ▁with ▁his ▁wife , ▁son , ▁and ▁mother ▁in ▁Den ver . ▁He ▁then ▁moved ▁to ▁Washington ▁D . C . ▁and ▁was ▁a ▁partner ▁with ▁Ward ▁Brown ▁until ▁ 1 9 2 9 . ▁His ▁business ▁activities ▁also ▁included ▁the ▁Bo als burg ▁Water ▁Company ▁( 1 9 0 3 - 1 9 2 9 ), ▁the ▁Bo als burg ▁Electric ▁Company ▁( 1 9 1 5