How to know if a contractor is legit?

[Anthony Robinson]

So I'm here looking out for my dad.(82 year old dude)

He needs to repair the stucco on his commercial building(16 unit Apartment complex) for the fist and second floor on the apartment complex.  He contacted the first Contractor he found on the internet and they quoted him a total of 95k for the job to complete.  

Ive had no experience with contractors in my life, but I did ask them for reviews or if they have had  any projects done locally.  They are on Angieslist(which I dont know how reliable this site is), and they only contain 1 review.  It is a positive review, however for this company to be in the business for 15 years, and only 1 REVIEW total online scares me. They could be legit and maybe its a word of mouth type of business and I could be worrying about nothing.

I'm just curious to see what BP thinks, I just want to look out for family and make sure he is making the right decision. 

I apologize if this was hard to read, I am not the best writer and thank you in advanced!