Generally any periodic inspection will just be to the outside, rather than disturbing the tenants and if you have friends and family in the area, you could just have them check it out for you, letting them know what to look for. 

I've had situations where the police wouldn't remove someone from the premise because she was in the tenant's unit and was not actively disturbing anything. 

@Andrew Casal the usual rule with plaster is, if you only have to disturb a small area (e.g., hanging something) then just leave the plaster, do your thing, patch it and move on.If you have to disturb larger sections you run the definite risk of breaking the "keys" that hold the plaster tight to the lath, so you might find that sections start to fall down which can create a cascading/domino like effect.There are probably ways to carefully cut out sections that can reduce the chance of that happening, but like I said, the general rule is that if you're disturbing large sections you might just have to replace the whole area with drywall to be done with it.I don't have specific tips on the gas and oil changes re: RI's commitment to reduce/eliminate them.

In my opinion it is always best to disturb your tenants as little as possible.

What is more disturbing is it seems like that kind of remark had some sense of acceptance or normality.

Especially if the guest does not require an immediate fix (I give them the option each time, some don't want to be disturbed).

Additionally, neighbors have attested they leave the garage door and storage shed open (claims that someone was in the house) and they have known to not take care of the property and also have caused domestic disturbances that caused the police to show up a couple of times. 

Also people who stay up late need to get up early so disturbing their mornings with some music/noise is in order and not illegal.

If the 12' section is in a crawl space or basement and is easily accessible and isn't leaking, don't disturb it.

The SELLER or current owner of the home who could not use a realtor, has absolutely no knowledge, skill, or understanding of the process of selling a house seems disturbed by me earning to much of a profit.The paperwork is at the lawyers office for pre-foreclosure to begin.