New construction home flip

Is $500K profit good for spending 3 million on a new construction home flip?

Basically 3 million covers purchase of old home, permits, architects/engineers, construction from start to finish , and closing costs are included. The 3 million is all inclusive of what it will take to make and sell the high end home in a high end area.

Timeline is 13 months from purchase of tear down to sale of new home.

Is the numbers of $500k profit on 3 million all in cost good economics?