Of course, your specific block may be higher or lower.

What I’m discovering is that just because a town allows STRs doesn’t mean the local laws make them operationally feasible unless you meet very specific criteria.For example, in Highland Lakes, access to the lake requires private membership, and it’s unclear if STR guests can use it.

I don't think its fair for you to say they are making money without it as I doubt you have access to their books. 

I have an up-down duplex a few blocks to the west in the Sheridan neighborhood - both units are 1+Den/1BA apartments. 

These relationships unlock access to properties that never hit MLS or Zillow.. exactly what you’re looking for.

You can only play games for so long.Chances are your next door neighbor is an IRS agent and turns you in when your tenants blocks their drive or some other random event disturbing your IRS neighbor.ADU catches fire and your insurance won't cover you, because it was an illegal and unpermitted structure.The city inspector told the last guy not to build or rent it, and is now pissed and wants to make an example of you and just red tags the whole property and no one can occupy for the next 1-2-3 years while you wait for a hearing.Then when you get the hearing, "staff" recommends you tear the whole structure down, and if you still want an ADU, you can apply for a permit and rebuild it.Your tenant quits paying rent and won't move out and you can't evict them, because there is no valid lease and they're just your "roommate".Probably a dozen other bad things can happen to you when you do stuff like this. 

Do the guests have access to see their own reviews by hosts?  

Quote from @Jay Hinrichs: Bruce there is also that famous case in San Fran  in the Seacliff area of 5 to 30 mil homes and someone bought their right of way on a small private street and were trying to block them off and then of course sell it back to these folks.

LMK if you need any help accessing those tools on BiggerPockets.

Worcester/Lowell are examples a bit outside of Boston but are markets appreciating rapidly and are a bit more accessible than Boston.