The difference between "the rent for this space" and "the rent for this space plus a new grease trap" is going to be nowhere near recouping money on the trap. L

The difference between "the rent for this space" and "the rent for this space plus a new grease trap" is going to be nowhere near recouping money on the trap. Like a car, expensive upgrades generally mean very little to future worth. It also works in reverse though - when you leave a premises, you don't have to strip out your custom fit-out and put the space back into how it looked before you left. The landlord can't say "I never liked your choice of lighting, so put it back the way it was", for example.