Having lived near there for the past 9 years, I didn't even know the place existed; its in a tucked away corner that hardly anyone comes across.  While it is a beautiful building in some ways, its a building.  If you want to preserve it buy the property.  It doesn't do anything for the community or area to have it there or not as its just not visible unless you work your way up to it and happen  to stand there inside it.  For historical purposes, document it - do photos, scans, etc and file them away.