This morning I've decided to visit the tower downtown I suspected was BSID:4241 or AT03XC265. Turns out the tower at 33°45'46.27"N, 84°23'0.37"W was owned by AT&T. Standing underneath the platform my signal was 90dMb. Hopefully it was mistaken identity and BSID: 4241 is much further away meaning the closest tower, AT03XC265, hasn't been upgraded yet. In other words, this give me hope for better building penetration.
Does NetMonitor only show CDMA towers? As mentioned here, the applications tower location data appears to be really off.