Suggesting this structure cannot be saved is hogwash. After 30 years in the building / restoration trade, I can say from real world experience that this small building would be no sweat to restore when compared to some of the stuff I have come up against. The real drive is to save it as an historic structure, rather than look at it from a economic viability perspective - which many engineers / architects do.
It may require substantial replacement of existing materials, but certainly can be done to original work standards.
The woman next door who told me she owned the building struck me as a ding without her ding biscuits, and this may hinder any progress toward any restoration ends. Those on the ground there may have a better handle on this roadblock. I suspect this is why it still sits derelict.