One of the biggest lessons I learned is that doing business with family can be challenging.

If you still want a partner, try local meetups, I host one in Norwalk CT—lots of investors need a trusted contractor.

Most commercial loans are 10 or 20 yearsif these are on separate parcel I would 100% treat it as 2 transactions as you could get a DSCR loan for the 4 unit and for the commercial a different loan. of it's one parcel and mixed use probably best you can do is 20 years 

One step at a time. 

I refused to renew the lease for one tenant which they've been there for 4 years. 

I'll also say that the Renegade meetup is the most valuable one to attend. 

•Instead of transferring the title, consider using strong landlord insurance, an umbrella policy, or a land trust (with your LLC as the beneficiary) for added liability protection.Your FHA Loan Potential for Another Property•Since your first home is already a rental but was likely purchased with an FHA loan, you may still be eligible for another FHA loan—but only if you meet one of these conditions:•You relocate at least 100 miles away from your current home.

We do NOT recommend falling into this trap - and it is a trap because one you start, they make it very difficult to stop. 

one property at a time. b. 

Quote from @Mason Jacobs: Quote from @Eric Goldman: Quote from @Mason Jacobs: @Eric Goldman had a good point, if you don't rent it out no one will lend DSCR, you might get a local bank but a DSCR doesn't work if you don't have it rented!