If the property is a multi family (2-4 family) and you, as the owner, live in one of the units, then you can use the tried, true, and tested HO-3 homeowners policy (with a few tweaks) to cover the entire building, its contents, and your liability exposure.
However, if you, as the owner, do not live at the property, you will need the proper Dwelling & Fire Policy to cover the building properly. The most popular of the policies is the DP-3.
The DP-3 is an “open Peril” policy that covers losses to the home’s structure, loss of use or rental coverage, and personal liability.
If the multi-family owner has an HO-3 on the property and lives elsewhere, they will NOT be covered for any losses by the insurance company. This is considered a material misrepresentation of facts. Most rental properties that are not owner-occupied must be insured under a DP-3.