Just notify your lender of what you are planning on doing ahead of time.

She is planning on renting out to section 8 and has pacified my worries about section 8 tenants.

In this manual (which I assume could be modified to provide to tenants) I include all the financing information (which you would not include for tenants) bank accounts, mortgage accounts, payment information, and mortgage payoff), a list of the contractors, what each contractor does, a list of upcoming planned or necessary repairs, and a copy of all leases associated with the property.

I'm looking to having my mortgages paid off as I plan on early retirement and the rentals are part of my retirement income.  

I will suggest you plan to House Hack a Duplex or Triplex or Fourplex every year for the next 4 to 5 years and you will thank me later.Goodluck man and keep us posted on your progress!

He knows we plan on continuing to grow our portfolio.

How do you plan to operate it?

A good real estate accountant can save you thousands of dollars by leveraging entity selection and formation, tax deductions, cost segregations, bonus depreciation and tax planning.I recommend finding an accountant who specializes in real estate taxation, business taxation, financial planning and tax planning.You may want to consider working with your accountant remotely to expand your options.I would also recommend looking for a accountant willing to work with you throughout the year.

As others have stated, your fit & finish goals should be guided by whether you plan to:1) Rent: tenants don't always take care of a property, so you want to use lower-grade materials and workmanship.2) Flip: higher quality on workmanship and materials is usually required.Regardless, you always want to "Maintain to the Neighborhood".

If you plan to resell, I think it's wise to discuss with seller in advance and that way the lien on the property can be transferred to second buyer, but you can continue to make payments at the former schedule etc.