I can't believe I'm 30 posts into this thread and no one has recommended a Section 351 exchange to Cardude! Cardude, a Section 351 exchange is just like a real estate 1031 exchange, except it's for highly appreciated stock(s).

You tender some portion of your BRK shares into the 351, and get issued a like dollar value of 351 ETF shares. Taxes are deferred, just like a real estate 1031 exchange. There are lots of them around; you would want to do a little research to find one that has a decent mix of stocks that you could live with, thus diversifying away from BRK. Some of them open up for funding, and then close to new investors. But if you start searching around, I'm sure you'll find a bunch of them. I know Meb Faber and Cambria has sent me advertisements for theirs. I've gotten other solicitations too.

There may be limits on how much you could transfer to any one 351 fund, but you could likely transfer to multiple 351 ETFs.

Tails