There are larger databases (Co-Star) that have information on larger properties, but I'm personally interested in small to mid-sized multifamily.  

However, this approach might add complexity, such as additional tax filings, self-employment taxes, and administrative costs.

We have added layer upon layer of complexity to keep it working, to the point now where it's a mess that nobody even those administrating it get anymore.     

You are talking spreadsheet language in the post that doesn't really correlate to real life unless you are very experienced and using this data based on your experience.

It will be interesting to see if the Commission imposes these light but annoying administrative penalties fairly. 

There is no public database for property values.

Chris I agree that the administrative burden drives minimum investment amounts higher to make sure the juice is worth the squeeze to the sponsor.

Absolutely- the OP was asking where he stores these in his "database".

The office administrator did the initial due diligence, the corporate counsel reviewed the lease, the accounts payable coordinator setup the accounts and sent the security deposit, one of the VPs signed the lease, and only after all of that occurred did I get the name and contact information of the tenant.- Now I am in their system as a Vendor/Subcontractor.

So in essence unless your going to fight (and pay) for a fair return against a fascist Oakland rent administrators - your profits will slowly decrease.