1611 116th Avenue NE is located in the Campus Office Park, just north the intersection with NE 12th (aka Bel-Red Road) and close to Overlake Hospital.
The 1611 building is on the north edge of the property; it is a one-story building. From the main entrance, turn left, go through the waiting area, and suite 209 is the 6th door on your left.
From SR 520 Eastbound:
Take the Lake Washington Blvd exit (immediately after the Bellevue Way Exit); at the next intersection turn right onto Northup Way and travel east approximately 1 mile; turn left onto 116th Ave NE and travel south approximately three quarters of a mile; the entrance to the Campus Office Park will be on the right. (Beware: the sign is not visible until you are very close to it.)
From SR 520 Westbound:
Take the 108th Street exit (the first exit after passing I-405); at the end of the ramp, make a sharp right and at the next intersection turn right onto Northup Way and travel east approximately 1 mile; turn left onto 116th Ave NE and travel south approximately three quarters of a mile; the entrance to the Campus Office Park will be on the right. (Again, be aware that the sign is not visible until you are very close to it.)
From I-405 Southbound:
Take the exit for SR-520 West (toward Seattle) but before getting onto 520 proper, keep right and take the very first exit for 108th Avenue; at the end of the ramp take a sharp right and at the next intersection another quick right onto Northup Way. Go up the hill approximately one mile and take a right onto 116th Avenue. Travel about three quarters of a mile and turn right into the Campus Office Park.
From Northbound I-405:
It would be natural to take the NE 8th exit, but it is difficult to get onto northbound 116th Avenue NE from this exit. A better route is to take the 116th SE exit (Exit 12); at the end of the ramp, turn left onto 116th (heading north); (alternatively, you could take the next exit, for NE 4th, to get to 116th); go past Bellevue's "auto row", straight through the intersection with NE 8th, past Overlake Hospital, through the intersection with NE 12th (aka Bel-Red Road). The entrance to the Campus Office Park is about 200 yards past the intersection with NE 12th, on the left.