This has been discussed in other places on this forum, but the "aforementioned security issues" for Federal buildings are nonsensical. There was once a time when the primary terrorist modus operandi was to attack federal buildings (e.g., the Alfred P. Murrah Federal Building) with bombs, but that all changed around September of 2001.
Terrorists in the 21st century have overwhelmingly set their targets on civilian public spaces (trains and busses, outdoor festivals and holiday celebrations, bars and restaurants and nightclubs, theaters, stadiums, streetscapes, etc.), not government ones. Modern terrorists are much more likely to drive a truck through a random crowd of people than pack a truck with explosives and park it next to a Federal Building. When attacks are carried out they're more likely to use guns and/or vehicles than bombs, and when any weapons are used (including bombs) they're more likely to be directed towards civilians.
Specifically designing our urban environment to protect against car bombs directly targeted at Federal buildings is a misdirected endeavor.