(a) In this section, "depreciation" means a reduction in value due to wear, tear, decay, corrosion or gradual obsolescence of a fixed asset having a useful life of more than one year.
(b) A trustee may transfer to principal a reasonable amount of the net cash receipts from a principal asset that is subject to depreciation, under generally accepted accounting principles, but may not transfer any amount for depreciation:
(1) Of that portion of real property used or available for use by a beneficiary as a residence or of tangible personal property held or made available for the personal use or enjoyment of a beneficiary;