That is a big red flag for me. 

Renters who deal in cash are a big red flag for a lot of landlords.

What are some positives and red flags that you all look for when assessing a specific market?

There are a few red flags here, so I'm proceeding cautiously. 1) the unit is a 3 Bdrm, but son says only the father would live there; 2) the unit is $1,300/mo, $400-$500 more expensive than 1 and 2 Bdrm units currently on Craigslist; 3) the son’s email is in poor English, like it’s not his first language, but when I spoke by phone with the father, his English was perfect.

@Jimmy Ogle  puts on OKC Dealmaker Sessions on one Monday a month.There is one tonight - 7-9pm @ Tower Hotel. 

It can be a red flag: trying to move before pending eviction hits record or they didn't give proper notice. 

Luckily I did charge additional security deposit because there were a few red flags in their credit history.

My natural instinct sends up red flags.

so much so that many contractors use red wood 2x4's as plates for walls being installed directly on concrete, particularly if the concrete is directly on the ground or in a basement. 

I own some units in a condominium that includes both apartments in a mid-rise tower and 3 story townhouses.