DO YOU OWN A HISTORIC PROPERTY?  You may qualify for Federal and State financial incentives for preservation of your property. Read more about the requirements as described in these Arizona State Historic Preservation Office web pages:
Tax Incentives and Grant Programs Overview
State Historic Property Tax Program

Not sure if you own a historic property?  Or perhaps you are looking for information on Tucson's historic districts?  Use the following resources to obtain documentation, maps, and property inventory forms:

Web page with a list of Tucson's National Register Historic Districts and their documentation.

Web page with a list of Tucson's Individually Listed properties in the National Register and their documentation.

Map of Tucson's National Register Historic Districts (594 KB), both existing and pending.

An interactive online map with multiple layers of information, including district boundaries, building footprints, and links to historic documentation. 

NOTE:  Turn on the historic preservation layers (see example here (700 KB)) and zoom in and out to view building footprints, and use the 'i' tool to get links and date for each building footprint.
City of Tucson GIS Maps Library

A Historic Preservation interactive online map with multiple layers of information, including district boundaries, building footprints, links to historic documentation, landmark signs, and historic markers. NOTE: Zoom in and out to view building footprints, and left-click to get information and links for each building footprint.