ed ▁at ▁Tower ▁ 2 0 0 ▁of ▁the ▁Renaissance ▁Center , ▁is ▁among ▁the ▁largest ▁hold ers ▁of ▁mort g ages ▁in ▁the ▁United ▁States . ▁Detroit ▁based ▁Qu icken ▁Lo ans ▁is ▁the ▁fifth ▁largest ▁ret ail ▁home ▁mort g age ▁l ender ▁in ▁the ▁U . S . ▁and ▁the ▁largest ▁online . ▁The ▁metropol itan ▁area ▁has ▁a ▁range ▁of ▁vent ure ▁capital ▁fir ms ▁which ▁fin ance ▁business ▁start - ups ▁and ▁ac quis itions . ▁ ▁The ▁area ' s ▁real ▁estate ▁invest ment ▁trust s ▁( RE IT s ) ▁which ▁include ▁Ta ub man ▁Cent ers ▁are ▁an ▁important ▁part ▁of ▁the ▁invest ment ▁community ▁which ▁own s ▁and ▁oper ates ▁many ▁major ▁sho pping ▁m alls ▁across ▁the ▁U . S . ▁Pul te ▁Hom es , ▁one ▁of ▁the ▁largest ▁home ▁build ers ▁in ▁the ▁U . S . ▁has ▁its ▁own ▁mort g age ▁company . ▁As ▁another ▁example , ▁General ▁Mot ors ▁inv ests ▁its ▁$ 8 5 ▁B ▁p ension ▁trust . ▁ ▁Detroit ' s ▁historic ▁Pen ob sc ot ▁Building ▁in ▁the ▁dow nt own ▁financial ▁district ▁is ▁in ▁the ▁heart ▁of ▁the ▁city ' s ▁wireless ▁Internet ▁zone ▁and ▁fi ber - opt ic ▁network . ▁ ▁Fif th ▁Third ▁Bank ▁which ▁maintain s ▁its ▁regional ▁headquarters ▁at ▁tower ▁ 1 0 0 0 ▁of ▁the ▁South field ▁Town ▁Center ▁announced ▁a ▁$ 1 0 0 ▁M ▁expansion ▁in ▁the ▁Metro ▁Detroit ▁area ▁in ▁order ▁to ▁take