What is the liability of a trustee who takes or retains possession of property that is not asset of the estate?

Where the trustee takes or retains possession of property that is not an asset of the estate, he is personally liable for damages arising from this illegal act, unless he acts both in good faith and with reasonable grounds for believing that his possession is proper. See Leonard v. Vrooman, 383 F.2d 556, 560-61 (9th Cir.1967) (trustee is personally liable for damages arising from his wrongful possession of "property which is not asset of the estate"); Green, 70 F.2d at 466-67 (trustee who occupies leasehold beyond date of rejection of lease is trespasser and is liable to lessor for reasonable worth of consideration conveyed to trustee after that date); cf. Gravure Paper, 234 F.2d at 930, 932 (trustee responsible for return of deposit on trustee's purported sale of lease, since lease had been rejected prior to purported sale and thus trustee had "offered for sale and 'sold' a lease to which he had no 'right, title or interest' ").