No, it's too low. There is a huge range though depending on materials and how reputable your contractor is. For concrete, with plenty of re-bar and high grade finish (meaning mahogany trim, panel or louver interior doors, custom cabinets, hurricane resistant windows) and not including upgraded kitchen counters and appliances, figure $125 to $150 pers square foot. Surely, someone will post next oh I can do it for less, but this is what it ends up being. Someone will always say they will do it for less, but you get what you pay for! Really!