Things to consider on first property at busy intersection

[Joseph Finley]

Hi all.  Looking at a (3) possibly 4 unit property for $45k.  It's rough looking on a very busy cross-intersection with gross rent of $1200/month.  The 4th unit was described to need work before usable.  

The (3) tenants have been there 10+ years.  I'm visiting the unit next week as details were slim on website.  I know the area relatively well.  

What things should I look for & ask about when on-site?  Yes, this is my first foray into rental properties.

Appreciate your time.