Sony didn’t give it to the restaurant; instead the restaurant purchased it during Japan’s economic boom.
In my parents place, an apartment in a second floor, there's an upright Yamaha that my dad bought in the late 70s or early 80s. I think they brought them in through the stairs, but like 10 years ago an elevator was added to the building lobby, and I don't think there is enough space to move it around. I think the piano will remain with the apartment forever :D