When do you need to know where the form was submitted from? If the visitor submits a generic form, you can use the Submission IP Address {/dataset/_submission_ip_address} in the process to determine which IP address the form was submitted from. If you know the IP addresses of the computers in each building, you can route the forms based on which building they were submitted for. 

If the form needs to know which building it is being filled out in, you'll have to use Javascript to grab the machine's IP and then use it to modify the form accordingly. 

Before your responses, I really didn't have an idea how to capture this. I am still fairly new to forms. However, I will need to capture the machine at the time of submission so I determine the user's location. Thanks for the replies. I will see if I can use this info to figure it out.

I tried adding 2 fields to the form to capture submission ID since there are 2 options. However, neither of them populate. I added two single line fields. One with Previous User Submission IP ({/dataset/_fs_submission_ip_address}) as a default and  the other with Previous Submission IP ({/dataset/_submission_ip_address}) as the default value. I think email the result to myself. Unfortunately, neither value is being captured. Is there another way I should be using Submission IP data?