Where the master policy stops. No single national rule divides the building between the two policies. The declaration defines the unit, and the condominium page explains the model-act default under which finished surfaces such as wallboard, paint and finished flooring belong to the unit while what is behind them is common. The master policy may then cover only the structure and common elements, or also the original interior fixtures, or nearly everything in the unit. The market calls these arrangements "bare walls," "walls-in" or "single entity," and "all-in," but no regulator defines those labels, so the only reliable answer is in the master policy and the declaration. Florida shows one statutory version: its master policies "must exclude all personal property within the unit or limited common elements, and floor, wall, and ceiling coverings, electrical fixtures, appliances, water heaters, water filters, built-in cabinets and countertops, and window treatments," and "such property and any insurance thereupon is the responsibility of the unit owner" (Fla. Stat. 718.111(11)(f)).
What the policy covers. The owner's share of the building, including improvements and upgrades the owner has made, is covered under the policy's dwelling coverage, often called Coverage A. In the 2000 edition the Texas Department of Insurance described in 2002, that coverage carried "a basic limit of $5,000" that "can be increased to meet the unit owner's exposure need," so the default figure is a starting point rather than an estimate. Personal property, loss of use and liability follow the homeowners pattern, and flood and earthquake are excluded as they are on other homeowners forms.
Loss assessment coverage. When the association suffers a covered loss to property all owners hold in common and the master policy does not pay all of it, because of a large deductible or a shortfall, the association can assess owners for the rest. Loss assessment coverage pays the owner's share of such an assessment, within its limit. Florida requires every unit owner's residential property policy issued or renewed on or after July 1, 2010 to include "at least $2,000 in property loss assessment coverage" with a deductible of no more than $250, and no deductible at all if one was already applied to the owner's own loss from the same event (Fla. Stat. 627.714). Elsewhere the amount is whatever the policy provides, so an owner in a building with a large master deductible may want more.
Who pays the master deductible. That depends on the declaration and state law. Florida makes property insurance deductibles and excess damages a common expense of all owners, except that a unit owner is responsible for repairs not paid by insurance where the damage was caused by that owner's "intentional conduct, negligence, or failure to comply with the terms of the declaration or the rules of the association" (Fla. Stat. 718.111(11)(j)). Elsewhere a declaration can charge the deductible to the unit where a loss began, which can leave one owner with a large bill that only their own policy can absorb.
What lenders require. Fannie Mae requires a unit owners policy when "any portion of the interior of the unit or improvements to the unit are not covered by the master property insurance policy, or the master property insurance policy includes a per unit deductible." The policy must be on a replacement cost basis, preferably on a special form, and must be at least the greater of the cost to restore the uncovered interior and improvements or the master policy's per-unit deductible, with a deductible no higher than the greater of 5% of the coverage amount or $2,500.