Sadly his wife passed away less than half way through the construction and the owner just dropped everything, leaving that part of the house unfinished with wood and metal beams revealing. 

I've taken care of a few small ones myself, but I just discovered a huge one (hopefully the source of all the trouble) as well as wasps in the attic while investigating load bearing beams for a possible renovation.

You can open it up but there will be a beam there. 

I’m trying to find a good contractor who can replace the main beam.

If you are dealing with an addition built on 12" beams (or if the original foundation is old and not built to current standards), the repair company might not be able to push the piers down to refusal depth or psi due to the beam not taking the load, thus leveling it, but not guaranteeing it will not continue to move in the future, thus not providing warranty.9.

Update @Daniella Sanchez - we just had a structural engineer come out and give us an idea of what work is required, the wall that I need fixed in the basement is bulging out about 3 inches so it either needs a couple of steal beams set up so that it doesn't keep moving OR replace the wall entirely...The bids I'd gotten were mainly for water proofing the basement.. sealing cracks, installing pipes to channel the water elsewhere, etc.

https://www.distillerytrail.com/blog/beam-announces-60-million-investment-breaks-ground-on-fred-b-noe-craft-distillery-returns-to-james-b-beam-distilling-co/?

If it does you'll need to make sure the footings under the beam in the basement were sized to carry another whole floor.

The fix for that is usually shutting off the power at the box on the side of the house where the cable from the A/C connects, hosing it out with a garden hose (use a wide spray nozzle rather than a thin "laser beam" of water, so you don't bend up the fins on the condenser), letting it dry out for a couple of hours, and then turning the power back on. 

I want steel beams and lally columns in the basement.