(p) To operate, repair, alter and improve any real property which be may hold or in which he may hold an interest or a participation; to erect or demolish buildings thereon; to enter Into leases for such real property or any part thereof or any interest or participation therein for any period of time: to mortgage such coal property or any part thereof or any interest or participation therein for any period of time; to grant options with respect to such real property, mortgages and leases or any interest or participation therein for any period of time; to perform, modify, waive provisions of, extend, renew, terminate or otherwise act in respect of any such leases, mortgages or options; to cause such real property or any interest or participation therein or any part thereof and himself to be insured against any and all risks; to retain an agent or agents for any of the foregoing purposes; std to do or omit to do anything of any kind or nature with respect to any such real property any pan thereof or any interest•or option with respect thereto aril the management ttaereof which he may in his discretion consider advisable, whether or not such act or omission is heremabove specific-ally mentioned, without bting.bounct by restrictions which might otherwise be applicable and without court approval. (q) To determine, in case of reasonable doubt on his part, whether any property coming into his hands committees income or principal, and whether any payment or expenditure made by him shall be charged to income or to principal. (r) To become or continue to be an officer, director or employee of any corporation, stock of which may be owned by the Grantor's estate or the Trust created hereunder and as such officer, director or employee to receive a salary, bonus or other compensation in reasonable amount for services rendered to said corponition. (s) To delegate to any one of the Trustees any nondiscretionary power, including but not limited to the powe