United States index map

Select the state in which you are doing research on the above interactive DueWiki map.

Site News

Welcome to! This site was developed to create a user-updated database of historical resources for the Real Estate Due Diligence Professional. The historical information Wiki (DueWiki) can be easily modified by anyone so that the information is current and useful for all site visitors. Anticipated site visitors include professionals conducting Phase I Environmental Site Assessments (ESAs) and Property Condition Surveys (PCSs). Also expected are those providing support research such as title searches and government records reviews involving local and federal offices, aerial photographs, historical maps, and city directories. Along with DueWiki, will be tailored to the needs of the Real Estate Due Diligence professional through the use of classified ads, forums, travel information, tech deals, and anything else of value. We're just getting started, so please bear with us as we work through any bugs or issues. New features will be implemented over the coming months.

What is a Wiki?

A wiki is a website that allows the visitors themselves to easily add, remove, and otherwise edit and change available content. It also allows for easy linking among any number of pages. This ease of interaction and operation makes a wiki an effective tool for mass collaborative authoring. The most popular wiki is Wikipedia, which is a collaborative encyclopedia maintained by users throughout the world. With your help, the wiki maintained on, affectionately named DueWiki, will develop into a resource that allows all of us to complete our work more quickly and with greater accuracy.


Tech Deals

As the amount of electronics equipment used by the Real Estate Due Diligence Professional has increased, so has the amount of money spent on new cameras, computers, printers, etcetera. will provide information regarding savings found on equipment that might be beneficial to those visiting the site.

CameraDigital Cameras at

Garmin Nuvi GPS units at


The forums on are provided for assessors and researchers to interact and help one another with questions and issues associated with Real Estate Due Diligence activities. In addition, we will hopefully be introduced to new methods and experiences that help improve our efficiency in the production of a Phase I ESA or PCS.

Although registration is not currently required to update DueWiki, please create an account so that you are able to interact on the forums and track any changes you make.


Primary Resources



Other Resources