message: MINOR: Bring buildings extrusion animation back.
diff: "fadeNear": 0.9,
  "fadeFar": 1,
  "lineFadeNear": -0.75,
  - "lineFadeFar": 1,
  - "animateExtrusion": ["step", ["zoom"], false, 15, true]
  + "lineFadeFar": 1
  },
  "renderOrder": 2000
  },
  