Each Historic Preservation Zone dates to a different period and has a distinct style or styles. The city has published design standards for each. Additionally, some neighborhoods have developed helpful guidelines to help the public and advisory boards evaluate a proposed project. Below are links to guidelines and standards to help design a suitable project.
Here is the link to the files related to the 2019 Design Guidelines update: https://drive.google.com/open?id=1Sgbt64-YA6t99Hj2fcuqQ3Awdvh9iMG1.
The latest version is here: https://drive.google.com/file/d/1Q1eCbYrOmTG__XeeXx1tWx8iWj7J4KSt/view?usp=sharing