Amazon won’t be the biggest game in town once Inova’s Merrifield campus takes shape

Inova Health System is cementing its vision for its research and development campus, a mammoth project compared to even Amazon.com Inc.’s (NASDAQ: AMZN) HQ2.

The Falls Church-based health system’s Center for Personalized Health, on the 117-acre former Exxon Mobil campus in Merrifield, is slated for an eventual 15 million square feet of development — notably eclipsing the Seattle e-commerce giant’s future 4 million-square-foot Northern Virginia footprint and promising tremendous economic…