You see the common routine for realtors, is empty the house and run as many people through there, as possible.

Or maybe the previous owner was worried about oil or grease stains.When we had our driveway redone, we asked for extra gravel and went with 6" of asphalt instead of 4" so that we wouldn't have to be worried about heavy equipment damaging it, but this is at our own home where we used to routinely drive heavy loads into our yard to get to the barn. 

However, if the $20k was routine maintenance and repairs it should come out of the numerator as expenses, not added to the $50k denominator.

I reviewed his lease and noticed that it had provisions prohibiting consumption of alcohol on the premises, as well as guests past 8pm, and he was routinely showing up to check on his tenants' compliance.

If you're going the umbrella insurance route, make sure it will cover you for several things including just the routine slip and fall (like mold or earthquake).

I am understanding that these numbers are not part of the Net Operating Income as they are not considered routine yearly expenses.

Most turn key companies don't scope the sewer line as a matter of routine.

At my own home I do early routine cleaning and maintenance which runs about 100$ a year, so wondering if this can be done every 6 months or every year to clean the drain pan, filter, etc. at what frequency? 

I recently found a very good foreclosure on Homepath.com, submitted an offer which was accepted, did home inspection, and then found out that no title insurance company is willing to insure this property because all foreclosures in Massachusetts are pretty much void because they did not comply with the correct notices for one reason or another, and also foreclosing banks often did not even have the papers showing they have the right to foreclose in the first place (they lied about it in court to get through this routinely, but eventually judges stopped letting them do this).

Use the credit card for routine purchases and pay the balance at the end of the month.