The exposureCo-op and condo coverage is about contents, liability, and the gap.
In a Manhattan apartment the building's master policy stops at the bare walls: sometimes at the studs. The unit owner's HO-6 picks up the finishes, the build-outs, and everything inside, plus loss assessment for when the building's deductible or an uninsured loss flows back to the shareholders. Get the walls-in boundary wrong and a burst riser two floors up becomes an uncovered renovation.
Above the apartment, the high-net-worth exposure is portable and personal: scheduled jewelry, art, watches, and wine that a homeowners sub-limit will not begin to cover, and a liability surface (household staff, entertaining, a second home, a young driver) that warrants a high-limit umbrella. This is specialty and excess-and-surplus territory, placed as one file rather than a building policy plus an 800-number quote.