▁their ▁families . ▁▁ 1 9 8 0 s ▁and ▁ 1 9 9 0 s : ▁The ▁institution ▁under go es ▁major ▁renov ations ▁to ▁three ▁of ▁its ▁four ▁cell h ouses : ▁A , ▁B , ▁and ▁C . ▁D - Cell house ▁today ▁remains ▁the ▁only ▁cell block ▁true ▁to ▁its ▁original ▁design . ▁▁ 2 0 0 5 : ▁Federal ▁Bureau ▁of ▁Pr isons ▁changes ▁US P ▁Le aven worth ' s ▁mission . ▁The ▁B OP ▁decided ▁to ▁change ▁the ▁cust ody ▁level ▁of ▁US P ▁Le aven worth ▁from ▁High ▁/ ▁Max imum ▁to ▁Med ium ▁while ▁retain ing ▁the ▁US P ▁design ation ▁for ▁historical ▁reasons . ▁▁ 2 0 1 1 : ▁The ▁Federal ▁Bureau ▁of ▁Pr isons ▁takes ▁comments ▁on ▁a ▁proposed ▁new ▁ 1 , 5 0 0 ▁medium ▁security ▁and ▁ 3 0 0 ▁minimum ▁security ▁facility ▁on ▁the ▁current ▁prison ▁grounds ▁on ▁ 1 4 4 ▁acres ▁to ▁the ▁west ▁of ▁the ▁current ▁prison ▁and ▁a ▁ 2 3 8 - acre ▁area ▁to ▁the ▁east . ▁ ▁Notable ▁in m ates ▁( current ▁and ▁former ) ▁ ▁Fam ous ▁escape es ▁Frank ▁Gr ig ware , ▁imprison ed ▁for ▁train ▁rob ber y , ▁escaped ▁from ▁Le aven worth ▁in ▁ 1 9 1 0 ▁with ▁ 5 ▁other ▁men ▁by ▁sm ash ing ▁through ▁the ▁prison ▁gates ▁with ▁a ▁hij ack ed ▁supply ▁locomot ive . ▁While ▁the ▁others ▁were ▁quickly ▁re capt ured , ▁Gr ig ware ▁escaped