A donor does not "gift" accumulated depreciation, as such. Rather, the donee's basis for depreciation is the donor's adjusted basis at the time of the gift, which in @AmeliesUncle's example is $35,000.
To put it differently, the donee does not take any part of the donor's previously claimed depreciation deductions and the placed-in service date is the date of the gift.
For federal gift tax purposes (i.e., filing Form 709), the value of the gift is its fair market value on the date of the gift.
