I'd call it a yellow flag.  

Jotted some notes on a yellow pad - which my friend who opened the house took a picture of.  

It was a dump when I first got it, realtor sign was knocked over and graffitied, paint peeling off the exterior, 5 different types of flooring from front door to the back sliding glass, all walls were Mexican restruant yellow, rents were $600-660.

Yellow letters, driving for dollars, trolling craigslist, attending REIA meetings, networking, create a website, etc.

I remember vividly the day it started.

My plan is to follow up with yellow letters a month later then post cards.

I am now considering looking into foreclosures and preforeclosures i.e your yellow letter suggestion. 

I really need to step up my game and try some yellow letter campaigns, and bandit signs. 

Just like the absentee owner who received his 1st yellow letter compared to the motivated seller receiving the 11th yellow letter and is ready to sell, situations and ideas change.    

What we love about Sicily is the pasta, First world amenities, having both a yellow and red Maserati blow past me on a curve doing 100, great cannoli and Arancina.But this is an REI forum.