Duplex construction advice

[Heath G.]

Please help me with my math. I am considering building multiple duplexes on vacant land that I own. However, I am being told that to build a 2,000 sf duplex the cost will be around $400,000. If I collect ~$2,500 in rent, I won't be able to cash flow. Is the total cost to build, correct? I'm in the O'Fallon, MO area. I will need a property manager as well. Any advice?