"An impending Astros move to the American League could violate the team's lease agreement with the Harris County Houston Sports Authority, according to a local attorney.

Kevin W. Yankowsky, a partner at Fulbright & Jaworski L.L.P., outlined his findings from a review of the lease in a Tuesday letter to J. Kent Friedman, the Sports Authority's chairman of the board.

Yankowsky, an Astros fan since the 1970s, will make a presentation at the Dec. 1 Sports Authority Board of Directors meeting urging a strict enforcement of the Astros' lease to play their home games at Minute Maid Park. The wording of the lease agreement, Yankowsky said, spells out that the Astros cannot play at Minute Maid as anything but a National League team without receiving prior consent from the Sports Authority."