Generally any multi family purchases 5+ units is considered commercial, and although many lenders offer financing, the down payment requirements will be slightly higher..usually 25-35% depending on the number of doors.  

It depends on one's financial strength, the quality of the property, how many properties they own, and other factors.I like to start with one significant expense and three months of vacancy.

It really depends on how active you want to be with it and if you have the time or not.

The manufacture asked me to provide an diagnosis  report from a professional to say needs to replace a new AC. 

I am providing SEO and digital marketing consulting for a design-build firm operating in established and up-and-coming luxury mountain communities in the Colorado Rockies.

SBA loans feature favorable terms, such as low down payments and longer repayment periods, and are partially guaranteed by the SBA, reducing the lender's risk.SBA 504 Loans: Another SBA program, the 504 loan program, provides financing for the purchase, construction, or renovation of owner-occupied commercial real estate or heavy equipment.

That will help us provide you with better answers. 

Ensure that she has renters insurance in the event that she floods or burns her place down - depending on how attached she is to her belongings she may seek reimbursement from someone (probably you).

It did provide us the clarity we were looking for. 

I'm committed to providing exceptional service to investors and am excited to contribute to the real estate investing community here on BiggerPockets.Looking forward to hearing from you all!