> I'm looking at an opportunity to buy a historic bed-and-breakfast in New Hampshire’s Campton area.

How can one go in the business at these levels?

All these strategies depend greatly on location, layout and your personal comfort level.   

Neighborhood & market-level data — Things like median rents, school districts, job growth, population trends, and recent sale prices within a one-mile radius.

On cue - 30 year primary rates have reached 6.19% - Wow.
How do you think this will impact your market? We continue to anticipate robust demand as affordability improves. 

A client of mine just closed on a 6-bed 5.5-bath house with a pool just a short walk from the beach in Murrells Inlet for about $1.1mil. 

It forces you to plug in those vendor quotes, CapEx timelines, rent growth assumptions, and neighborhood-level vacancy trends.

The last 2 years we haven't even hit 50% occupancy levels.

Regardless of your level of plain/simple vs rustic vs fancy, you can do it for much less by just going to used furnishing stores (primarily).I used both 1) high-end second hand stores (meaning not primarily Goodwill and Salvation Army), and 2) lower level antiques stores where they have decent pieces for say < $500.

National builders who have the benefits of economies of scale have largely stopped building entry level housing.