I have a graphic-design (all Mac-based) client in Boulder, CO who has recently expanded their facilities. They now have separate offices directly across from each other on the Pearl Street Mall. The shortest distance from window to window is 77 feet across the Mall, with deciduous trees partially blocking the view for 8 months of the year. This client has gigabit networking installed in both offices, with 48-port 3-Com managed switches. The primary office has the file server which employees access via ethernet, with blazing file transfer / access speeds. The satellite office is currently connected to the primary office with the latest Buffalo 802.11ac router and ethernet bridge, but file transfer speeds and access are dismal -- a single TIF file, 4.02GB in size, takes 43 seconds to copy from server to workstation in the primary office, but takes 9 minutes, 42 seconds to copy via the Buffalo devices at the satellite office. Because of these unacceptable speeds, the company needs an alternate method to allow/maintain gigabit network speeds from the primary office to the satellite office. The city of Boulder will not allow a ethernet cable to be strung or buried between the two offices, which is unfortunate. My research has determined that mounting a laser beam transmitter / receiver on the roofs of the two buildings is the best option. I'd like to know if anyone out there has experience with such a setup, and if they have advice on what is the best equipment and who is the best vendor. However, I'd also like to hear from anybody with alternative suggestions. Again, the goal is to have gigabit speeds between the two offices, so that employees in the satellite office can access the file server with identical speed as those in the primary office.