You say those don't BRRR & attract top dollar, the best value in BRRR right now is primo properties cause you're not getting a 1:1 on any upgrade you're getting higher.

Because the place is over-ran with the "bad", attracting more of the same, running off any "good". 

Low down payment (3.5%) is attractive, but comes with mortgage insurance and might not offer the best rates.

No one is entitled to a Pacific Heights apartment, it is up to you to create enough value to afford to live there.My comment on partnership in solving the housing crisis has to do with California making it more attractive for landlords and developers to do business here.

The purpose of marketing is to attract an in-person showing.

The higher credit is attractive, but what if the couple's income is 3.2x the monthly rent and the single woman makes 6x the rent?

I think it's going to be location specific for sure; where I am very few people hang out in the house all day long as they are usually busy hitting the parks and attractions. 

The older you get the less attractive appreciation is unless the goal is to leave some kind of legacy. 

How much will depend on how well their processes are designed.

You can find them through local real estate investment groups or online platforms.Auction or Estate Sale: If the property has unique characteristics, especially being a large, old Victorian, it might attract specific buyers looking for such properties.