Perhaps take a look at:  https://www.loopnet.com/ and see which types of commercial lease listings interest you and from there take inventory of which brokerage and listing agents are prominently features in the space that interests you.

The house has been featured in magazines and garden tours and is valued around $1.8M.

Thank you in advance.

For the listings that are struggling, try using the calendar promo feature on Airbnb to help boost visibility.

Thanks in Advance

Here are a few suggestions on how you can maximize the wealth of information available: Check out the blogs and podcasts, or take advantage of the search feature (magnifying glass).

I have never used that feature in RH, are any of you using that? 

With the change, platforms started to emphasize more and more on pricing, unique features, accommodation, and availability over host qualities such as super host status or overall ratings.

Closet not always necessary: While a closet is often considered a bedroom feature, it's not always required by building codes to classify a room as a bedroom.

If there are any modifications to their current contract, ensure that the lease renewal is shared with them in advance, clearly outlining any potential changes.