District of Columbia Form 1D-Commercial Property is a form used to provide information about the ownership, use, and/or occupancy of a commercial property in Washington, D.C. The form is used to collect information relevant to the taxation of the property. There are two types of District of Columbia Form 1D-Commercial Property: 1) the Initial Filing Form and 2) the Annual Filing Form. The Initial Filing Form is used when a new property is being registered with the District of Columbia. It collects information about the property owner, the property address, and any applicable tax credits and exemptions. The Annual Filing Form is used when the property is already registered with the District of Columbia. It collects information about any changes in the property, occupancy, or ownership since the last filing. Both forms are used to ensure that the District of Columbia is collecting the correct amount of tax revenue from commercial properties.