I think your best approach is to pretend you are the investor yourself, calculate build cost (mortgage with interest) + Maint / cap expenses/ management fees according to your zoning and then compare that to the average rent in that neighborhood.

I am comparing both of them right now and while people seem to prefer Propstream, I am surprised to see how many comps do not come up in the search, while Batchleads and even Zillow give me more results (using the exact same filters).

However as you correctly point out this is far more risky and or its risk capital compared to buying a income property.. but the reward can be strati-spherically higher .. not just a little bit but it can be life changing profits on some of these deals.

Days on market is about 2 months, slightly better than earlier this year but relatively speaking, it's still a more balanced market compared to rest of the Bay Area.

Use tools like Zillow, Rentometer, and local real estate listings to compare prices and rents.

Tools like Rentometer and BiggerPockets can help compare rental prices, and working with a CPA and attorney will ensure you structure your investments properly.

Negative it’s rather complicated as compared to other real estate investments.

There are many variables that increase real estate returns and they are rarely addressed when comparing it to the stock market.

Ask anyone who ever tried to sell a cash flowing biz, it's not that easy (compared to selling a house)The best play IMO is to run a business and feed the profits into real estate.There are a million ideas, but you can start here: https://www.biggerpockets.com/biggerpockets-business-podcast Thanks for the suggestion Marcus. 

Be sure to run numbers with both a local lender and a national one to compare terms-sometimes smaller local firms can surprise you.HOAs: Brickell condos often have HOA fees, which can eat into your cash flow.