Since Bristol did not challenge the agency's reasoning until April 20, more than 10 days later, its protest on this ground is untimely and will not be considered. [2] Our conclusion is not changed by the fact that GSA recently awarded Bristol a lease for space in its offered building under an SFO that required amenities within 2,000 WLF. GSA explains that, in addition to the 2,000 WLF amenities re