+1 on Donation.
Another option is to call around to salvage yards. I'm sure more than a few of them will give you a little cash for a running e34.
3rd option is Craigslist. Price it low enough and your phone won't stop ringing.
The models and equipment (standard and optional) illustrated in this post reflect my misunderstanding of vehicles supplied by BMW AG to the German market. In other EU member states, the truthyness of my posts may vary. Please ignore this post. Subject to change.