Money no object? Well then, erm, a largish converted barn house with another small barn attached which could be converted at the front to look like a continuation of the house, but which could be decked out for the buns on (at least part of) the ground floor and onto which a mesh 'conservatory' could be built as a run for them. Oh, and a walled garden. Always wanted a walled garden. And good for bunny-proofing.
In the meantime - if I had a small windfall. A 5x7 pent shed, with tongue and groove, an opening window and a stable door. Modified to also have an inner mesh door (made with decent galvanised mesh). With a runaround trapdoor, leading to a runaround tunnel through to the garden. And a new wooden run in the garden - which is at least 8x6. And a decently bunnyproofed back garden (no more planks held in place with bricks!) for free-roaming.