na i ▁ ▁Many ▁historic ▁buildings ▁are ▁still ▁fully ▁functional ▁and ▁host ▁government , ▁business ▁or ▁educational ▁establish ments . ▁Chen na i ▁is ▁home ▁to ▁the ▁second ▁largest ▁collection ▁of ▁her itage ▁buildings ▁in ▁the ▁country , ▁after ▁Kol k ata . ▁ ▁Fort ▁St . ▁George ▁▁ ▁Bu ilt ▁in ▁ 1 6 3 9 , ▁Fort ▁St ▁George , ▁used ▁to ▁house ▁the ▁T amil ▁N adu ▁Legisl ative ▁Assembly ▁and ▁Secret ariat . ▁T ip u ▁Sultan ' s ▁can n ons ▁decor ate ▁the ▁r amp arts ▁of ▁the ▁Fort ' s ▁museum . ▁The ▁Fort ▁has ▁the ▁country ' s ▁tall est ▁flag st aff ▁at ▁a ▁height ▁of ▁ 1 5 0 ▁feet . ▁The ▁fort ▁is ▁one ▁of ▁the ▁ 1 6 3 ▁not ified ▁areas ▁( m eg al ith ic ▁sites ) ▁in ▁the ▁state ▁of ▁T amil ▁N adu . ▁ ▁Che p au k ▁Palace ▁ ▁Con struct ed ▁in ▁ 1 7 6 8 , ▁it ▁was ▁the ▁first ▁building ▁in ▁India ▁constructed ▁using ▁the ▁Ind o - S ar ac en ic ▁type ▁of ▁architecture . ▁It ▁was ▁designed ▁by ▁Paul ▁Ben field , ▁a ▁British ▁architect . ▁The ▁Che p au k ▁Palace ▁used ▁to ▁be ▁the ▁official ▁residence ▁of ▁the ▁N aw abs ▁of ▁Arc ot . ▁It ▁has ▁a ▁total ▁area ▁of ▁ 1 1 7 ▁acres ▁with ▁two ▁blocks ▁- ▁Kal as ▁Mah al ▁and ▁Hum ay un ▁Mah al . ▁ ▁Senate ▁House ▁