A couple of observations. 

A rooftop deck would also add about $100-125 a bedroom.

Mathematically speaking this is completely incorrect- and a rather humorous observation was made by Joe.

What are some of the key points of consideration one should observe before taking out a first-lien HELOC?

Its office/event space, so we have a rooftop patio, 11th floor common area, our office, and a meeting room to chose from.

It'll be interesting to observe how Cleveland's rental market shifts over the following months.

I noticed a couple interesting observations in this thread.

Although I watch the market as a curious observer..

You give us permission to discuss our observations with real estate agents, owners, repair persons, or other interested parties.

Also, property prices can't go to the sky because of affordability so the capital appreciation potential of the most expensive US markets might have been reached for some time, especially in our new world of high interest rates.I agree with you, your observation about Airdna's comparisons being somewhat of a misnomer has been my experience in south america too.