Who Owns Historic House Plans? To the Editor: Here's a question about John Leeke's article ``Historic House Plans'' (Restoration Primer, 7/89). Does the homeowner have the legal right to grant permission for his house to be drawn, or does consent lie with the original architect (or his estate), or someone else? I'm sure many historic homeowners would be flattered and more than willing to allow you or me to measure and duplicate their homes (once they are convinced we aren't burglars). I'm interested in where the legal lines are drawn, however. I am moved by the work of several architects — Frank Lloyd Wright in particular. My impression is that the F.L. Wright Foundation claims copyrights to all of his work