TheCup.us says the game is at Belson. That site is pretty reliable. http://thecup.us/2016/04/07/2016-lamar-hunt-us-open-cup-schedule-results/
Our 3rd round opponent will be an amateur side and the capacity of Belsen, (2,500) is more than enough to handle the low attendance. The Cosmos played the Jersey Express last year in the 2015 open cup. I guess the rent for Belson is cheaper than Shuart on that day
At Fordham it will be http://www.empireofsoccer.com/nycfc-u-s-open-cup-match-to-be-played-at-fordham-48322/