First: "Excellent condition" and "having a tech look at this piano" seems almost contradictory.
Of course, every used piano should be inspected by a reputable technician. If the "excellent condition" statement comes from one who does not know much about pianos (maybe a private seller), then having a tech inspect it is very important. If, however, the piano is known to be "in excellent condition" then why is it being further inspected?
As for price range, given that the above suggests that the true condition may not really be known, it's risky to even suggest a range. I see that one was recently sold by a US dealer for $6500.00. However, a 4'7" grand is not a size that most serious pianists would even consider, and a better option would be a quality upright.
Your best bet is to ask the technician, based on his assessed condition of the piano, what he things its value might be. Remember, too, that value of a used piano can vary considerably depending on location and the local market.
Regards,
