Take the BTS to Ekkamai or Phra Kanong. A taxi from either station to Falcon will cost about 80 to 100 baht. If you get a taxi at Ekkamai, it's best to cross over Soi Ekkamai (Soi 63) and walk a little way down the soi, otherwise you may end up going down Sukhimvit and getting caught in the traffic.