About half our personal residence (on a college campus) has been converted into long-term separate-entrance studio rentals for students. So, we deduct a pro rata share of general maintenance costs (gardening, driveway maintenance, outside painting, etc, all work done by licensed private firms) against these rents along with appropriate depreciation, pro rata utility costs, etc (and our tax preparer concurs in this).
SInce we've developed long-term relationships with some of the maintenance workers involved, we also generally give them a cash tip at Christmas time. OK to deduct a pro rata share of this as part of the rental maintenance costs?