You just may need to install an interior door that doesn't allow the upper tenant to access the lower unit.

Purchase price $53K cash, used LLC - Lesson learned with buying cash...killed my liquidity- 11 months in ownership the tenant destroyed the property, stole all the appliances and even stole the interior door, then locked me out of the property.- A year later I built up money for rehab (cash + busn credit card) - $30K - rehabbed the entire house, except the roof, windows and doors.- Property now rented for $1000 per mth- Current Value Estimates: Redfin - $114K, Trulia - $113K, Zillow: $113K; still doing research on comps because the area is hit and miss so last I saw was a projected $100K***************************************************************************************************************************- Navy Federal Credit Union say they can do 65% of original purchase price in cash out refinance - $34K- Hard-money lender offered $30K at 9.9% for 6 months as rehab loan, which I'd use to replace roof, windows, doors, and cutdown at few trees;  then cashout refi for 50% of the appraised value between 6 and 9 % depending on personal credit.

If I had done the interior painting myself, it would have looked terrible - they smoothed out the textured walls and it looks great.

Are you thinking only interior cosmetic no plans? 

It depends, a big con is you do not get to see the interior of the property.

Do interior survey?

In addition to this you will need to trim out the interior for your new windows. 

I don't even bother getting interior brush and roll painting bids anymore.  

I get an interior designer can do the finishes for the most part, but I'm referring to a combination of structural and cosmetic design? 

You can also rent out the interior to a content creator,  the swimming pool to a family having a cookout (swimply app) and the garage for storage all at once.