I use Realist for contact addresses and Spokeo for phone numbers.

If you choose to buy apartment complexes you will have 1 address instead of 20 with homes.Know that there is good debt and bad debt. 

I'm currently planning on hand addressing all envelopes (my list is about 400 properties, starting small) and signing all the letters.

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

Also, there is an IRS memorandum which explains in great detail why a transaction of this type was considered acceptable when the applicable laws and legal doctrines were applied to it.

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

@Jose Pena I can tell you on the phone but you have to be really control freak....lolI have accounting background plus my first bachelors degree in engineering so I understand numbers and extremely detail oriented.

I do plan on finishing the basement and establishing an address at the property so all of this will go away soon, but I want to do my best to comply in the mean time.

what the PP and address ? 

You don’t mention where you’re from, but municipalities have ways of determining whether you actually live at a property or not (i.e. change of mailing address, more than one property in your name, etc).