Own Albion
Yes, you can theoretically own every building and every business in the world of Fable II, but according to Peter Molyneux to buy absolutely everything the world has to offer will run you around 100 million gold. Given that a massive castle in the rich part of town will cost you a million gold, that's a lot of cash. Still, you won't necessarily have to earn it all, as you can also play the real estate market - buying properties then trying to sell them later for a profit. You can also make friends with the owner of a property, and maybe he'll offer it to you for a lower price.
Das ist ja krass.
