Likelihood of mold?

[John Schnyderite]

Entering basement definitely has an odor. Floors and walls are dry now, but there are signs that at one time, there was 2-4 inches of water in the basement. I don't know when this occurred, but do know the house has been vacant at least 6 months.

What are the chances this place has mold? Would the wood beams be rotted as well or could I just take out the drywall, have it cleaned out, and put new drywall up?

Not sure what to factor for repairing the water issue, mold, and putting walls back up...anyone with similar experience have an idea on cost of such a job? how much would you factor for if you were making an offer on a home with this situation?