Friends of the Parks' executive director sent the memo, a copy of which the Tribune obtained, to group board members Thursday in consultation with the group's executive committee. The document was drafted in response to a desire among some group members to become more flexible on the Lucas Museum. Friends so far has opposed any development plans along the lakefront, and the group's federal lawsuit aims to block the project — "Star Wars" creator George Lucas' would-be showcase for his art collection — at the original proposed "parking lot" site south of the Bears' stadium.