You miss my point. I was asking why such a quantity of money was needed to restore the apparently long-lived 'quality' structure, not how it had got in that state.
£5m to repair and alter the structure. Some of this is because the Western side's structure would be stripped back to the steel reinforcement to permit new use. Bear in mind that the structure has had over 40 years of constant use.
£2m to bring the building up to modern H&S standards and DDA compliance.
£0.25m to dismantle the concrete aprons on the Western side.
£3.5m to refurbish the building (most of the materials including the floor are original so this is an understandable figure.
£0.8m for a new coach station (I don't understand why this is necessary to be honest).
£0.3m for a covered walkway
£0.3m misc costs
£0.5m to remove existing bus station tenants
Add optimism bias and profit and that reaches £23m. A new much smaller bus station without a car park and without the new use permitted by the alterations would be £15m, only £5m cheaper but probably end up costing more in the long run in terms of providing retail space and parking. Value for money?
How much of their budgeted fund will the World Monument Fund be putting forward to back their placement of Preston Bus Station on that status they have so endowed ?
I suspect that not only will they not have enough money to maintain any valued monuments but they won't have enough to pay researches and project leaders for their time, and hence are dependent on volunteers.
As a mere student who will probably be overdrawn by the end of the month (though less than the last two quarters) following voluntary work last summer, I wouldn't be able to support a structure financially.