The zoning code spells out what uses are allowed in which land use zones. If your warehouse is on land still zoned industrial, you will find that there are limitations on non-industrial uses permitted on the site. Sometimes a use that is not allowed outright, by the zoning code, can be approved through a land use review. Land use reviews are often a lengthy and expensive process, since the law requires that most of these reviews include public notice and the opportunity for input.
A change of use, for purposes of the zoning code, can require bike parking, additional vehicle parking and/or changes to the parking, or paving and landscaping on the site. Exterior changes to a building, in many areas of the city, must go through a design review process to make sure that the proposed changes meet any special design guidelines for the area in which the project is located. The requirement for design review can be triggered by a very minor change, such as installing a replacement window that is not identical to the original.