I know as you mentioned classic cars are a big thing in our part of the country -- could  you start some sort of Guys/Car hangout - use the front office as a clubhouse - lots of old auto memorabilia there and in the warehouse (plus you'd have the fun of shopping for it), maybe install an automotive lift or two, great lighting - fire suppression system (would definitely make your insurance cheaper)? 

I inherited a whole room of Elvis memorabilia.

The house is on a corner lot, it has a lot of old "memorabilia" in the driveway, and the whole property could use a facelift and it would definitely be a bonus for the whole neighborhood.My question is, how do I motivate this person to sell?

You can try selling some of your baseball memorabilia from you playing days.....lol.

This is the same stuff people use to do table tops with memorabilia - eg pennies, bar tops - so it is a very thick layer. 

Note that everything is fair game if you leave it accessible - Fine china, memorabilia,  heirlooms, even your favorite ice cream or personal hygiene items (your shampoos, hair products, brushes, etc are fair game if they are not locked away in the house, Replace them and hide away the stuff you wouldn't want to be used by someone else or broken.7.Make sure you have somewhere to go on short notice and for days at a time.

Get some cool sports memorabilia, Hershal Walker autographs etc...fans will love it.

We've learned the hard lessons of HOAs (letters about work trucks parking an 1") on the grass, sports "memorabilia" on the porch (it was a decorative plantar), etc. 

It was a practice bomb from wwII. after he called to collect his memorabilia and they said it was missing.

And she finally came around and said that she is serious about getting rid of the property and she is packing up memorabilia at the current moment and later down the road when its closer to move time she will be having a garage sale.