The same advice about vertical files at a university or museum applies to the Inn locality. Historical societies, museums, professional societies (to do with inn-keeping, perhaps?), universities all may have records that could help. Are there publicly accessed tax records? (Here in the US our buildings aren't so old, but going back to the early 20th century those records still reflect who owned various buildings). Might work to make more connections with people or places with information to mine. Paper trails (or microforms) may or may not be digitized.