The Chicago Historic Resources Survey (CHRS), completed in 1995, was a decade-long research effort by the City of Chicago to analyze the historic and architectural importance of all buildings constructed in the city prior to 1940. During 12 years of field work and follow-up research that started in 1983, CHRS surveyors identified 17,371 properties which were considered to have some historic or architectural importance. The CHRS database identifies each property's date of construction, architect, building style and type, Chicago Landmark status (LM), inclusion in the Illinois Historic Structures Survey (ISS), and property identification numbers (PIN). A color-coded ranking system was used to identify historic and architectural significance relative to age, degree of external physical integrity, and level of possible significance.
RED (RD) properties possess some architectural feature or historical association that made them potentially significant in the broader context of the City of Chicago, the State of Illinois, or the United States of America. About 300 properties are categorized as "Red" in the CHRS.
ORANGE (OR) properties possess some architectural feature or historical association that made them potentially significant in the context of the surrounding community. About 9,600 properties are categorized as "Orange" in the CHRS.
GREEN (GN), YELLOW-GREEN (YG), and YELLOW (YL) properties are those generally considered either too altered or lacking individual significance to be included in the CHRS database. However, properties with this color ranking that are included in the ISS or located within designated or potential Chicago Landmark districts were included in the CHRS.
BLUE (BL) properties are those constructed after 1940. These properties are considered too recent to be properly evaluated for architectural and historical significance and were generally not included in the CHRS database. However, properties already considered for individual Chicago Landmark designation and properties located within designated Chicago Landmark districts are included in the CHRS.
Presumably they limit this list to red and orange because they are relevant to the Demolition Delay process described in #26, but it would be good to have all items (green, yellow, and blue) in this database.
This data is an easy way to provide context to demolition permits already on the Edifice maps website, since it contains a sort of built-in backstory on how many demolitions there were of orange and red buildings, how many times a 90-day hold was received (the more controversial demolitions have many holds), and so on.
Related to #26.
The Chicago Historic Resources Survey (CHRS) is some great stuff. Complete details here: http://webapps.cityofchicago.org/landmarksweb/web/historicsurvey.htm.
Relevant snip:
The Chicago Historic Resources Survey (CHRS), completed in 1995, was a decade-long research effort by the City of Chicago to analyze the historic and architectural importance of all buildings constructed in the city prior to 1940. During 12 years of field work and follow-up research that started in 1983, CHRS surveyors identified 17,371 properties which were considered to have some historic or architectural importance. The CHRS database identifies each property's date of construction, architect, building style and type, Chicago Landmark status (LM), inclusion in the Illinois Historic Structures Survey (ISS), and property identification numbers (PIN). A color-coded ranking system was used to identify historic and architectural significance relative to age, degree of external physical integrity, and level of possible significance. RED (RD) properties possess some architectural feature or historical association that made them potentially significant in the broader context of the City of Chicago, the State of Illinois, or the United States of America. About 300 properties are categorized as "Red" in the CHRS. ORANGE (OR) properties possess some architectural feature or historical association that made them potentially significant in the context of the surrounding community. About 9,600 properties are categorized as "Orange" in the CHRS. GREEN (GN), YELLOW-GREEN (YG), and YELLOW (YL) properties are those generally considered either too altered or lacking individual significance to be included in the CHRS database. However, properties with this color ranking that are included in the ISS or located within designated or potential Chicago Landmark districts were included in the CHRS. BLUE (BL) properties are those constructed after 1940. These properties are considered too recent to be properly evaluated for architectural and historical significance and were generally not included in the CHRS database. However, properties already considered for individual Chicago Landmark designation and properties located within designated Chicago Landmark districts are included in the CHRS.
Data here http://webapps.cityofchicago.org/landmarksweb/search/home.htm. Leave all values blank and click "search" to get a full list.
The data portal contains files for all red and orange buildings:
https://data.cityofchicago.org/Historic-Preservation/Chicago-Historic-Resources-Survey-Red-and-Orange-B/ty7a-2bxt
https://data.cityofchicago.org/Historic-Preservation/Chicago-Historic-Resources-Survey-Red-and-Orange-B/cmb2-8jw8
Presumably they limit this list to red and orange because they are relevant to the Demolition Delay process described in #26, but it would be good to have all items (green, yellow, and blue) in this database.
This data is an easy way to provide context to demolition permits already on the Edifice maps website, since it contains a sort of built-in backstory on how many demolitions there were of orange and red buildings, how many times a 90-day hold was received (the more controversial demolitions have many holds), and so on.