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When one unit is sold, the new owner becomes responsible for whatever increase in property taxes arise. If one owner makes a renovation that triggers a reassessment, that owner bears the burden of the tax increase.
Unlike a condominium, a TIC is not legally divided into separate units. TIC owners receive one property tax bill for the entire building. Although the owners typically agree to pay their share of the tax based on the price they paid for their unit, each owner is legally obligated for the whole bill. If one defaults on his share, the others have to pay it.
Over time, as units change hands and owners improve their units, each owner's percentage of the tax bill changes.
For TIC owners who request it - separate assessments for individual units are available. Separate assessments will not change the fact that each owner is still responsible for the whole building's property tax.
In short the tenant that causes the new tax is responsible for paying the new amount and then their share increases since their unit is higher in value (when improvements are made) or appraised higher than the others when new purchase happens.
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