Land value for condominiums

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Hi,

I just bought a a condo in a large building of 20+ condos, it is currently being rented out to a tenant. I am trying to figure out what my building / land ratio would be, for depreciation purposes.

How exactly do I find this? According to the online accessor page for my condo the land value is 0. Is this right? Or should it be the building's land value divided by the number of condos on the land?

Thanks,
Rishi