Contacts, calendars, shared docs, Google Voice, and even some simple, free and effective Google sites.

Once you get the rent whether it is the cash or cheque or online payment, simply check their name off a list knowing you got rent from each location/room or write it on your calendar for that month.

If Contractor has not cured such breach within seven (7) calendar days from its receipt of Owner’s written notification or if such breach cannot be cured within such seven (7) day period, then if Contractor either does not begin cure within such seven (7) day period or fails to diligently prosecute cure to completion, Owner may terminate this Contract and take possession of the Work.

Sounds good, marked on my calendar 

Then go in to your calendar and block those dates.Then the current owner will need to contact each of his future bookings and let them know he is selling the property but working with the new owner.  

@Alex VarnerI have been a contractor for 12 years and require 50% deposit to get on our calendar.

Let me see your training calendar....again no calendar, then you have to wonder how serious they are about training.3. 

The buyer made the escrow deposit but was made several days after the 3-day timeframe specified (6 business days/8 calendar days).

Problem is, from reading the lease it says that CAM charges are treated as 'additional rent' so should be paid and treated same way as rent (that means there are penalty and interest charges for paying late, and it's due on the first day of each month) but it doesn't say anything about what we can do if tenants paid the deficiency CAM for the previous calendar year late. 

They do keep the calendar and you have an owner portal where you can make owner reservations.