The first floor is rented out to a tenant and the second floor is vacant.

Let's assume a 1000 sf of flooring per unit. 3units *1000 sf = 3000 sf.

You can't point to anything concrete, but you know.

The first floor is rented & second floor is vacant.

We have since updated the house by redoing the kitchen (quarts counter tops, tile floor, tile backsplash, and upgraded to stainless steel appliances.

I fully intended to rent it out by the room, but while reading some HOA documentation I discovered it very clearly states:"Leasing: Any dwelling that is leasedshall be leased only in its entirety; separaterooms, floors, or other areas within a dwellingmay not b~ separately leased;"Short term rentals are not allowed, either. 

The roof will need fixing or replaced, some of the floors on both the top level and main level will need to be gutted.

Home will list for 530K. 4 Bedrooms, 4.5 Bathrooms. 2 Master Bedrooms / one on each floor and each of the bedrooms has its own bathroom.

My wife made the floor plan and made all the design choices that made it sell so quickly.

A slanting floor can also be a telltale sign of foundational issues.