Several companies have been working on the CityPlace development project before Monday's massive fire.
The 41 Action News Investigators have confirmed Titan Built, LLC is the main contractor for the project.
Officials ruled on Tuesday that the fire was accidental and started by a welder, who accidentally ignited wooden building material nearby.
Tuesday afternoon, the company issued a statement about the fire.
"We are deeply saddened by the circumstances of yesterday's fire at CityPlace. Our dedicated team has worked diligently on construction of the development, and were heartbroken by the destruction on the property and in the adjacent neighborhoods."
"Our primary concern is for the health and welfare of employees and the surrounding neighbors. We are very grateful for the heroic efforts of the various fire departments that responded to the situation."
"Titan Built has meticulous safety protocols in place; in our 42-year history, we have never experienced an incident such as this. We are closely working with the Fire Department and actively participating in the investigation to determine the cause, all toward implementing preventative processes in the future."
On Tuesday, teams of investigators spent the day pouring over the scene.
"We're working this with several agencies like Overland Park, the Kansas State Fire Marshal's Office, it's a community of fire investigators have come together for this scene that is something in my time I have not seen," said John Ham of ATF.
The 41 Action News Investigators have also confirmed a subcontractor on the CityPlace project is Garrison Plumbing.
Garrison Pflumm Sr. says his crew of three to four people was working on a building next to where the fire started, ironically, putting fire caulking around the plumbing in that building as a preventative measure.
The 41 Action News Investigators have also confirmed another subcontractor on the project in an electrical company called Pro Circuit.
A spokesman says the company's crew of 6 to 8 people was also working on another building next to where the fire started.
He says his crew left the work site Monday at 3 p.m., right before the fire broke out.
He also says the company may have lost some equipment being stored on site due to the fire.
Overland Park city records show another company issued permits to work on the project by developer Block Real Estate Services is Nearing, Staats, Prelogar & Jones, an architecture firm.
City records show the firm presented several drawings for the project to the city as recently as last August.
Andy Alcock can be reached at firstname.lastname@example.org.