This way, if someone feels rejected unfairly, you can show that your decision wasn’t based on any illegal discrimination, but on consistent standards applied to everyone.Alternatively... you could just ghost applicants but that's not always everyone's style lol 

I think the biggest mistake that people make, is thinking that investing in STR´s is some totally different style of real estate. 

Upgrade to a commercial-style stackable setup that can dry faster (30–45 minutes), hopefully fitting in our existing laundry closet without extra electrical work.Any recommendations or specific brand/model suggestions for handling this high-volume, semi-commercial laundry?

It could be a good option if the investor strongly desires ease and passive style.

I also believe many of the people will not have 2nd homes   For example Altadena has slightly high, for coastal CA, RE prices but household income is near the median for CA.  

Location. 25 minutes to beach, 40 minutes to Florence, 15 minutes to Pisa, 60 miles to snow skiing.  10 minutes to Home Depot style store, etc.  

So, overall, I think these four areas are very distinct in the style of life they offer.

It was a 1962, ranch-style house with blocked galvanized pipes and a busted water heater!

Rather, they are four former commercial real estate brokers, with one of them also an attorney in their 60s or 70s that have a true hands-on style of mentoring.

San Diego’s average house hold income is about what you stated, but the median is a surprisingly low (considering US news and world report lists it as the most expensive US city) ~$100k.