It is just south of the Lincoln Station light rail stop, the southernmost point of the light rail. Here is a link and a map.
You can park in the parking lot with the yellow signs in the picture above.
Here is a street view approaching from the north:
The cross street (and the entrance to the parking lot) is a street labeled 10380. Here is a picture of the street view approaching from the south:
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The Harding Law Office located at 10400 Park Meadows Drive in Lone Tree. It is south of Park Meadows Mall and E-470, just a bit northwest of the intersection between I-25 and Lincoln Avenue (NOT Lincoln Street downtown).
The name of the building is Aspect.