The following are links to various resources you may find useful.
Real Capital Analytics
Real Estate Journal from The Wall Street Journal
Rental Housing Association of Puget Sound
Seattle Daily Journal of Commerce
Seattle Department of Planning and Development (DPD)
Seattle Public Utilities
Debt Coverage Ratio (DCR) worksheet from CCIM Institute
Dupre + Scott Apartment Advisors
Global Research Project
Institute of Real Estate Management
National Association of Realtors - Commercial Real Estate Resources
Puget Sound Business Journal