15 - 20 year hold time.The rental investment calculators show that the four $300k properties would have a lot more equity in the future and many times the cash flow after a few years, but does the extra maintenance, management time and expense, etc. outweigh the numbers?

So lower Days on Market, and near or above asking price is usually the turning point (or just before) when buyers for land are most active.

In practice, this could mean 5 extra days that no rent is collected.  

I usually give them 30 days, but I will allow them to leave earlier with just one week's notice.

Duplexes usually get a carve out, but triplexes not necessarily if you add ADU+JADU. 

(I’m ignoring any extra cap-x because you said it was a condo, but you’d also add any major cap-x to cost basis).

They are billed as "a scientific approach to single-family rentals" and use "institutional grade property management," which usually means they are a tech company in real estate and likely either don't have the existing property management relationships in each area or you chose an area where they don't have enough units through Roofstock for the PM they chose to care.

Ensure you understand local regulations regarding permits; it’s usually a good idea for your associates to form an LLC for liability protection, but individuals can do renovations as long as they pull the necessary permits.

At the end of quarters, months and years, they usually have some killer deals.

Renovating usually means you need money to renovate.