With the backlog of Chinese investors waiting for green cards, Emilie Cooper, a partner at law firm Haynes and Boone, and formerly with Kasowitz Benson, says once an easy source of capital, EB-5 visas now face uncertainties.

The greater Redmond market has been driven by the explosive growth of Facebook's virtual reality division, Oculus, which now occupies more than 885,000 square feet, and investors are taking notice.

While fundamentals remain strong, investors agree that the end of the cycle could be getting closer, and it is causing a flight to quality.