Do some research to learn how a good property manager behaves, then spend a LOT of time researching and interviewing until you find a quality manager.Remember: cheaper doesn't mean you'll make more money.Start by going to www.narpm.org to search their directory of managers.

As appreciation slows.  

Hi Hai, the best place to start is simply searching the BP forums.

Security deposit amountYou can find plenty of examples by searching for "tenant estoppel certificate doc" or exchanging "doc" with "pdf" for more options.Here is an example and explanation: Sample EstoppelSome have a lot of legal jargon but this document does not need to be so detailed.

They are horribly slow and make the entire process exceedingly cumbersome for both a broker and the borrower. 

Here are a few suggestions on how you can maximize the wealth of information available: Check out the blogs and podcasts, or take advantage of the search feature (magnifying glass).

Prices in the city have literally doubled over the last 5 years, and it doesn't seem to be slowing down.

You can typically see seller builder names listed then you can research the LLC and get a contact via google or county parcel search.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

Since Sean and Zachary have already answered your questions, I will comment on your search for an accountant.