I ended up asking my partnership for a copy of their Form 8283, "Noncash Charitable Contributions".
I decided I probably needed it, despite the contrary advice from the partnership's tax people. The K-1 instructions say to simply enter the amount on line 12 of Schedule A (1040). Next to line 12 is a note saying that if the value is over $500, you *must* attach form 8283. When you read through the instructions to 8283, right on the first page, it says that passthrough entities like partnerships must provide their partners with a copy of the partnership's Form 8283.
