/diy/ - Do It Yourself

Posting in this thread since the other thread I didn't get any responses.

So due to recent major flooding i've been able to buy some land for really cheap with a house, garage, and warehouse already on it. This land flooded 7ft and floods often which is why i got it for very cheap. Everything is pretty much stripped to the studs so I have an opportunity to expand a lot of the buildings.

One thing I want to do that i'm not sure if I can is build 1 structure on 2 or 3 different foundations. There's a garage and a warehouse that have foundations that line up with eachother, but there's about a 10ft gap between them. My ultimate goal would be plan 2, which is fill in the gap with a new foundation and connect both buildings to make a huge structure. Since it floods i'm going to make the 1st floor just a garage area with nothing really valuable, but the second story would be living space, to either lease or live in. I'm concerned about the foundations settling at different angles and heights and slowly ripping the structure apart.

I have a lot of experience working in residential construction, but I have zero knowledge of proper codes or architectural requirements. This is in Texas and the land has no HOA so there's not a lot but I'd still prefer to do it the right way if I ever decide to sell it. Can I do this? Is there anything i'm overlooking? Where should I look to read about proper code? I really want to save money by doing it myself. Any responses are appreciated.