Re: Merion, if you built it today, with the published safety guidelines that Jeff Brauer refers to, you would have to throw out holes 2, 7, 8, and possibly 14 and 15 for being too close to the property lines.
Re: Moortown, Paul, I don't know why the standard is different. When the course was built originally, the old par-3 12th and the par-4 17th were built right up against the property lines, but there were other golf courses (Moor Allerton and Sand Moor) across the fence. Those golf courses sold out to housing estates and moved, and the new homeowners demanded changes. I've been told that in these sorts of disputes in England or Australia, the golf course has no chance -- it's creating the danger so it has to make the change, no matter how long it's been there.