Based on my knowledge, your opinion, and what others have said; it may be best to hire a reputable architect as the builder will most likely outsource the design and mark up the cost. 

I’m willing to bet most investors here would not do something like that for fear of harming their reputation.  

You may also want to think about employing reputable property management company for your remote operations.

In addition to the military bases, they have a number of reputable hospitals too.https://austin.culturemap.com/...https://realestate.usnews.com/...

I just researched them and they have a really bad reputation...

If he knows you might threaten his reputation he might be more inclined to do the right thing.Get those quotes documenting that this was the builders fault to back you up.

What is their reputation and samples?

We were all in on RE, putting all of our extra money we saved toward the next down payment and the renovations.

It's essential to familiarize yourself with the local landlord-tenant laws and work with a reputable property management company to ensure smooth operations.Short-Term Rental Laws: Philadelphia has regulations on short-term rentals, but it is still possible to operate Airbnb and similar platforms within the legal framework.

The Inspection:I can't stress enough how important it is to hire a reputable and qualified inspector.