Arash: I've had good luck using REA to track my tenant-rep completed deals and prospects. You can input the lease terms including start/end dates, payment, sqft, etc. and set reminders for yourself to check back. It also works great for logging your interaction with prospects and taking notes.
REA is pricey though, I think $695 for a stand-alone copy. You can get many of the same features through ACT! which is a plug-in to Microsoft Outlook.
Both of these are excelent solutions, but may be overkill if you're only managing a few clients - in which case a simple Excel spreadsheet may be the answer. Once you get above 100 records though, it's time to invest in one of the big boys. Good luck.
Nov 16, 2010