They will never be able to afford a new HQ until they sell some of the old buildings. The city is obviously unable to do anything with them. A commercial developer may be able to rehab them into something useful. They should start selling off all the useless buildings and use the money to lease a building somewhere cheaper than downtown. The only people who need an office downtown is the Chief and his inner circle. They can put them in city hall next to the Mayor and move some of the lower level