Storing the restored bike is a problem many of us sit with.
First of all is the standard of restoration, where a frame not properly prepared and primed, and the inside tubes at least Tectyl'ed, will sit and rust anyway, the inside of fuel tanks is another great worry.
Sitting in winter damp, even inside, does them no good either.
The only longterm way is the climate-controlled room, which is very far out of my reach.