Property taxes - double check this assumptions here are reasonable in your cash flow projections.

Check out the Rookie Podcast.

I've gone through eviction court proceedings, ran thousands of background/credit checks for application, made numerous leases, dealt with repairs and whole house renovations when a few tenants nearly destroyed properties, and worked with property management companies on the HOA units. 

I knew the property was going to perform well- all the boxes were checked.

Since it doesn't sound like you have a pre-existing relationship with a builder I'd spend a LOT of time checking references and their other projects prior to picking a team.

That is something to check.

Check local laws to see what you can do.

I'll let you know how much their CEO cares about customer service.  

For our local laws as well as other resources (like blank forms for use) check out RHAWA - it's the Rental Housing Association of Washington.

Check with some of the local REIAs to see if there are any interested buyers, have the host blast out an email to all members.