There were 80 people at the open house. there were many curiosity seekers and brokers also there.when the smoke cleared we were down to 3 serious candidates.

I also inspect plumbing to assure there aren't any leaks, maybe filter replacement, co and smoke batteries.

Worst case, you embrace the Dark Side of land-lording and retain the services of an eviction lawyer.

For example, With the smoke and cat urine, I would need to pull up all the carpet, remove the staples, clean and seal with Kilz, and repaint and lay new flooring.

I can detect smells most people just don't notice.Use an Ultraviolet light in the dark and animal pee will glow.

Benefit is the rent, and risk may be franchisee failure and going dark, being a STNL as compared to multi-tenant or a land lease. 

My main concern is this tenant is a smoker.Now the lease she she doesn't stipulate anything about smoking or not smoking but for my personal health and the state of the property i am on the loosing end. 

the investing world is littered with investor just as your self who have been wiped out on a project.I understand your new.. and all.. and most folks on BP asking for advice are.but this is a highly risky business.. the business of buying and flipping.you based on your questions are far to Green to really know what to look for or how to protect yourself.If you want to flip houses and your using your own cash and credit.then just buy it yourself... and hire a reputable GC... ( even this has risk ) but you don't need a buinch of mouths at the trough sucking up what little profit there is and potentially leading you down a very dark hole.

Sometimes you forget some people still smoke inside.

If dog urine seeped into hardwood floors, it may result in a dark stain that could be permanent.