If the day is miserably hot, I supply Ice,GatorAde and fans..

Supply is limited for sure. 800 sales in September vs 400 last September. 774 in October vs 429 last year.

Multiple demand generators that will likely get stronger. 

Expensive things to look out for: foundation issues, termites, plumbing supply and drain to the street, outdated electric panel (60 amp fuses) and shake shingle roof in bad condition. 

Another option is they could possibly sell part or all of the business to a stronger operator.Being in the food business for decades myself before getting into commercial RE it sounds like to me the wife likes running the business and the husband does it on the side while most of his focus is on his job that pays the bills.

I worked in such industries as hotels, pharmaceutical and biotech, then most recently building supply.

As the single-family market heats up in the stronger areas, investors get pushed out by end-user buyers, forcing investors to shift to less desirable areas (with slower markets) or into syndications simply to allocate their capital and end the madness. 

A couple of days pass and the broker calls me and tells me the owners really likes me but feels I needed to have a stronger track record.

The rental market is strong with not enough supply.

This shows a low supply and lends itself to a sellers market.