> The property's mere continued existence is adding that value.
And did you keep a straight face while you were typing those words?
Let's say that I own a car.
I purchased this car as a new car some time ago. I regularly fail to perform maintenance of any kind. I frequently operate the car when it is critically low on lubricants and coolants. I regularly strike deep potholes and large rocks during my travels.
I frequently eat inside the vehicle. It is littered with food wrappers and decomposing partially-eaten meals from months and years gone by. I also frequently transport unwell animals inside my car. These animals often vomit, urinate, and defecate inside the car. I have never cleaned the interior of the vehicle.
Because of my failure to maintain the vehicle, its engine and suspension are a wreck. They are dangerously unsafe. Because of my failure to clean the interior of the vehicle, it is -at best- a horrifying, ungodly, malodorous mess, and -more likely- a serious health hazard.
My wilful negligence has significantly decreased the value of the car.
Why does your assessment of the situation change when the durable good changes from an automobile to a multi-family dwelling? Is it because the on-paper value of the building has dramatically increased over the past couple of decades?
If it is, then you must understand that the credit for that on-paper increase in value is to be completely given to the local government, because of its zoning laws which have resulted in a dramatic undersupply of housing in the area.
The landlord in this situation is -like our negligent car owner- failing to maintain (let alone improve) his durable good. In a sane market, this would cause the on-paper value of his durable good to decrease.
I say again. $CURRENT_LANDLORD has done nothing to improve the value of his property. To this I add: The City is the one who drives the value of his property up and hides the deleterious effects of his negligence.
Now do you understand how you misunderstand the rather special situation in this city?