Not likely, at least not for buildings or pools. He's probably looking at closer to 6,000 square feet of usable space. Especially since it's a corner lot.
Jim, as a Licensed Surveyor, I strongly recommend making a current survey part of your due diligence in any property you buy, There can always be hidden easements and other things that can affect your usage of the property. Also make sure you have full knowledge of any restrictive covenants and other documents that affect and control usage. Rural properties are generally only bound by restrictions from the county level, but suburban and urban properties may be bound at the County, City and even local neighborhood levels.
I've attached a drawing of a "typical" corner lot in my area, complete with building setbacks. Obviously, the lot you're looking at may be configured completely different and subject to different setbacks or easements, but this should give you an idea.