Cost of fiber run between neighbouring office buildings

Hi folks, I wonder if I can tap into some knowledge on the list and ask for ballpark figures on how much it would normally cost to run 2 fiber cables between 2 adjacent office buildings. I have a quote from a contractor, and I want to make sure i'm not getting totally fleeced. The conduit is in place between the buildings. The work entails: - 2 x 6-Strand 50/125u multimode, Tight Buffered, Armoured, Laser Ultra-Fox Fiber cables - Distance of run is approx 520 meters - Total of 8 terminations (2 strands on each end of links) - Testing, documentation Thanks, Hank