The Art Institute of Chicago Land Surveys
 
James Schaeffer and Schimming were contracted to provide layout control for all aspects of the project. From laying out the building control to anchor bolt locations JSS equipped the entire site with the precision and accurate structural placement it took to complete the job

Here we see a survey done of lot one in block 3 in Ashland addition to Chicago, being a re subdivision of the overall Chicago subdivision. This survey seems to also require a vertical component in the Chicago City Vertical Datum system. I am sure I will cover more on CCD, or Chicago City Datum, in later posts as they arise.
 









