▁C od man ), ▁Mr . ▁V ander b ilt ' s ▁Bed room ▁and ▁Bath room , ▁Gu est ▁Bed rooms ▁and ▁Bath s ▁and ▁the ▁Lin en ▁Room , ▁are ▁dis posed ▁around ▁the ▁Second ▁F loor ▁Hall ▁and ▁the ▁North ▁and ▁South ▁F oy ers . ▁The ▁third ▁floor ▁contains ▁five ▁additional ▁guest ▁bed rooms , ▁and ▁a ▁Serv ants ' ▁Hall ▁separated ▁from ▁the ▁guests ' ▁rooms ▁by ▁a ▁door ▁at ▁the ▁main ▁st air case . ▁Support ed ▁by ▁both ▁concrete ▁and ▁steel , ▁the ▁V ander b ilt ▁m ansion ▁was ▁considered ▁modern ▁for ▁its ▁time . ▁The ▁m ansion ▁also ▁included ▁pl umb ing ▁and ▁forced ▁hot ▁air ▁central ▁he ating ▁and ▁electric ▁light ing ▁which ▁was ▁power ed ▁by ▁a ▁hydro elect ric ▁plant ▁built ▁on ▁the ▁estate ▁on ▁the ▁Cr umb ▁El bow ▁stream . ▁The ▁V ander b ilt ▁estate ▁had ▁electric ▁light ing ▁before ▁the ▁surrounding ▁area . ▁ ▁Her ter ▁Brothers ▁and ▁A . ▁H . ▁D aven port ▁and ▁Company ▁were ▁sub cont ract ors ▁who ▁executed ▁McK im ' s ▁interior ▁designs . ▁The ▁V ander bil ts ▁also ▁h ired ▁Georges ▁Gla en zer ▁and ▁Og den ▁C od man ▁to ▁decor ate ▁several ▁rooms . ▁E . F . ▁C ald well ▁& ▁Co . ▁manufact ured ▁the ▁majority ▁of ▁the ▁light ing . ▁ ▁Gard ens ▁The ▁Italian ▁gard ens ▁are ▁det ached ▁from ▁the ▁house ▁and ▁incorpor ated ▁formal ▁elements ▁typical ▁of ▁the ▁Italian ▁style