If you take the rewards in cash back you need to claim it as income.

Typically, maintenance & repair expenses may eat up the couple of thousand you earn annually in the early years. 

Say your firm splits 50/50 with you (there will be some variation of the split it could be as much as 80/20 or 70/30) but that $12,000 comes into the firm and say you get 50%, so your taxable income on the transaction is $6,000. 

The suburbs will be higher taxes but generally better schools and higher income tenants.

I was thinking I would reinvest some of the rental income to make some minor repairs/maintenance around the home.

When dealing with two separate houses on the same lot being sold together, it is important to consider several factors in determining how to calculate potential rental income.

Even the house is fully paid off, the 1% property tax + 1% maintenance offsets 2% annual gain.

Typical rates are 8-12% of income either monthly or yearly depending on manager.

If you are selling your business, what are you two doing for income now (goes toward financing ability)? 

Are you able to take advantage of the ADU as an expense against other income (W2 other gains) where you could get back most of it?