My advice is to tread very lightly.

Tile backsplash, floors, lighting, full bathrooms, cabinet pulls, etc. 

@Jose Palma Im an investor and agent in Chicago, but have also been happy with eXp Realty based on their flexibility with self branding and also low commission cap. 

The easiest thing for me to do at the time was a T-shirt brand ( AY Asher Apparel), so I started creating designs that would allow me to make products with a print on demand company.

My 2nd option, is to continue renting let them sell at market value and purchase a brand new house at 700k bring my monthly to about 3k.  

I was light on cash with all the deals I had going on at the time but knew this was too good of a deal to pass on.

As stated, using other's money is a huge responsibility and shouldn't be taken lightly.

Lenders, you may be able to shed some light on this, what I cannot understand is how a $500,000 multifamily property with secured leases and history of positive cash flow is so much "riskier" than a single family home of $500,000.

@Joe Splitrock is there a particular brand/type of ozone machine you recommend?

There were several instances of homes with CSST piping being struck by lighting and the CSST piping contributing to a house burning down.