Premier League Handbook 2015-16, rule 314 page 387:
"One indoor Artificial Surface pitch measuring a minimum of 60 yards by 40 yards which shall be owned by the Club (or alternatively the Club must have a legally enforceable agreement with the owner of the facility for its use by the Club, expiring not earlier than the end of the current Season) and which shall be for the exclusive
use of the Academy at all times."
Note the exclusive use of the Academy at all times.
http://www.premierleague.com/conten...handbooks/premier-league-handbook-2015-16.pdf