Hi,

In summary, very large and very old outbuilding.  Thick stone wall with corrugated rood. Typcial historic farm outbuilding found on Dartmoor. Associated with resdiential house to east which is missing from OSM.

I do know the area, and ironically have been delayed answering because I've been staying in Dartmoor area for the last few days. The building is easily viewed and next to a very popular PRoW in the very popular Postbridge area.

The building is a large outbuilding associated with a house to the east of it. The house and another outbuilding are missing from OSM. These buildings look newer (but still 19th Century). All on OS OpenMap Local

Bulding looks very old, with large rough granite stone construction, with a modern rusting corrugatged roof. Typical Dartmoor farm building. Now an outbuidlng for an expensive house. Confident, but can't prove, built as farm outbuilding.

So mapping original use
building=farm_auxiliary ?
or
building=outbuilding
