I do collect all of these details, email addresses and phone numbers, and have quite a database that also needs harvesting and communication as you indicated but I think this is just a small piece of a much greater marketing plan.  

I'm from San Diego, CA and currently work in IT as a database administrator, while also taking classes to get my RE license.  

I will upload lets say 4 or 5 letters, so for example, if I set my parameters to mail my database once a month, first it would send letter 1, next month it would send letter 2, ect ect.3. 

If I had time I'd compile it myself (I'm kindof a list/database geek) but unfortunately, I don't have that kind of time...lol.

In addition, in my opinion you'll get much more rent for the third unit than the rent increase.Spend some time figuring out what your property is zoned at (probably in tax database).

Or can I use realtor.com and like databases to discover most of the information I would need?

Regarding private and hard money lenders - BiggerPockets has a hard money lender database that you can search.

If you can't make your own spreadsheets or databases, quickbooks is usually a good option for bookkeeping.

Hello:Does anyone have any suggestions for a commercial (5 plus units) RE agent/broker or even a website/database? 

I have thousands of investors built up over 15 years in business in my database so if I put together a deal getting equity funding for it is not that hard.