As an example, I personally do not care for oil heat:  I do not like the liability of storing several hundred or thousand gallons of fuel oil (effectively diesel) on the property and, do not trust tenants to keep the tank filled.Regardless of the heating solution you choose, your best return comes from the fuel you do not use (Negawatts or Negabarrels).  

This has been discussed in other threads going back for months, esp the number of condo projects now coming online, when you have a building with a few hundred units completed it’s going to have a major effect on the YoY numbers when the whole county new listings are only around 4000 per month. https://seattlebubble.com/blog/2018/06/12/around-the-sound-king-county-sees-the-biggest-gains-in-listings/

They are also a retail store (the only retail in the building) and they have been putting goods for sale out on the sidewalk during the day.I don’t like it, but they are a long term tenant and I don’t want their first impression of me to be a jerk trying to throw my weight around...How should I approach this issue?

A tip that I received from one of the Bigger Pockets' books was to include a family picture at the bottom of your letter. 

You can also check their reviews online at Google, Facebook, or Yelp.

You can also check their reviews online at Google, Facebook, or Yelp.

Any information about where to start and any tips and tricks would be much appreciated.

If my guys and gals I fund want to use them I don't care I just don't want to deal with them.PS I like the car business if I was not doing this I would own a dealership... and I would finance sub prime auto debt.. big money in that these days.a few of my fishing buddies own big stores like Toyata and Chevey stores they as you well know make bank.. 

Any quick tips, books, articles, blogs etc you could send my way that would be great!

I have been lurking on this site for a couple of years and have enjoyed reading the various posts and listening to the podcasts, along with reading books and researching online.