Email from building manager to all of the tenants:
Please be aware that the parking lot is for the customers of the XXXX - your customers. Tenants are not allowed to park in the lot overnight - and please do not even consider parking for an extended period of time. Many of you are going away for the Holidays - we wish you well. If you want to find your car when you return, we strongly suggest you park it somewhere other than the XXXX parking lot.
Have a wonderful, fun-filled and prosperous Holiday.
Reply from one of those tenants:
Might I suggest a more diplomatic approach when communicating with your customers, threats are seldom appreciated.
Sort of humble reply from building manager: