maybe meet up to discuss business? 

Does my down payment have to come from my business bank account?

2. how would it being a business asset impact tapping into the equity?

My sister and I are working to partner up for a real estate business.

Long-term rental and a short-term rental are two completely different business/investments.You should understand what each requires and see if you are comfortable with them.Short-term rentals, on paper, generate more income but require more work.

All pay electronically through our business DBA.

Though my real estate business focuses on multifamily housing, this topic resonates deeply with me.I remember talking to my father about why he lived at home after graduating from college in the 1950s.

Although I don't think you could do that and charge monthly electric costs too.

This is where your costs will come into play.  

With the current market, I will not be able to make my required cash flow after paying all operating cost including mortgage, vacancy, property tax, insurances, maintenance cost, no need for a property manager because I can manage it.