The easiest answer is to tell them we operate the stadium under a finance lease, where the risks and rewards of ownership are effectively transferred from the lessor to the lessee. We are entitled to keep all the income deriving from our use of the stadium, while paying an agreed sum to the lessor (i.e. the council). We can also carry out any changes (presumably subject to their approval). Tell them to go away and read FRS102, which will explain it all. That usually shuts them up...
...And then, once you have lulled them to sleep by quoting smallprint, slap 'em on the head before jumping off of the train.
Top tip1: Wait for the train doors to open before jumping off.
Top tip2: Don't try this on a boat.
Top tip3: Avoid falling asleep before they do. Remember, it takes many years of Jedi-like accountancy training before one can master this technique without oneself succumbing to its soporific effects. Try reading aloud passages of Alan Shearer's autobiography, to begin with and build your tolerance up from there.