Just my personal opinion and a little hear say through the years.. Elvis loved the old oigonal mansion, it's special areas that some to this day are actually not aware of/ Like any house, there are nooks and crannies that amaze even the buyer, if the seller has not pointed them out.
I think Elvis loved the open land, hated to see it closing in, with everyday business' and the like..
His need for privacy would have been fullfilled nicely without every adding anything, minus the many people who lived there and needed to go home.
Some were body guards and friends, and as we know some were moochers.
Elvis would have bough that beautiful place in Colorado, had they not said no to a fence..(the crazy people!)
He wasn't out to change Graceland that much..just add some more areas where the "Clan" could hang out and give him some elbow room..and if he wanted to join them, he could..if not he went to his own upstairs private place, and we already know he spent a good deal of time there.