In my opinion -- and I am not a technician -- the lack of tuning over the years shouldn't be that much of a problem, particularly if it was reasonably in tune with itself when you tried it. It may, however, if it is significantly flat overall, take several careful tunings to bring up to pitch. Your technician should be able to comment on that when he or she looks at the instrument.
Nor should the lack of playing have hurt it. What you may find there is that it is rather stiff at first; if you do purchase it, you would want to play it a lot for a while before any action or regulation issues were looked at.
It always seems to me so sad that people buy pianos and then use them as coffee tables, or flower holders, or whatever...