Everything Ken said plus plaster walls, no insulation, higher electric bills, walls sweating when its humid in florida and the resident leaves front door open, damp smelly houses, Pealing paint, wood rot, old windows, crawl space under the home, bdrm and closet doors that don't close properly, electric locks that the old front door doesn't like as the door is not aligned correctly, Cyrstal knobs that fall off, old thermostats with 2 lines but my new thermostat needs 3 lines, critters in the fireplace....

The house will need new interior everything - plumbing, electrical, kitchen, bathroom, walls, etc. 

My spouse doesn’t love having a tenant and sharing walls with someone but can see the benefits.

Damage to the unit like a doorknob hole in the wall?

I would not call it an open floor plan by any means, we are talking about a lot of walls and ceilings. 

Just use archive.ph for any pay wall articles.

**Basement Water Damage:** The walls in the basement are wet up to 15 inches, and it appears that water is seeping in from the ground.3.

He has developed a map of the city and surrounding areas with color codes.

Really inexpensive to do (usually), especially in truss framed houses that have no bearing walls...takes about 30 minutes to tear down the partition wall and voila, there you have a huge open space.

I don't care about someone's color, religion, sexual proclivities, their stance on green energy, political affiliation, etc.I want people that pay rent on time, take care of the property, and communicate when needed.