Flipping Unpermitted Work San Antonio TX

[Eli S.]

Hoping someone has had some experience with this...

I just bought a house that I am going to flip. Property is in fairly good shape and only needs cosmetic upgrades on the inside. Thing is, county records show it having 1 less bathroom and about 250 sq ft than it actually does. It looks like they added a bathroom and extra living space without a permit in the past(looks like at least 20 years ago). I am planning to remodel and sell the property but don’t want any issues to arise with the unpermitted work. What steps do I have to take to get everything permitted the right way. Would the city make me tear it down? Remove drywall? Any recommendations are appreciated. Thanks.