They paid good wages but also kept a high bar on quality and performance. The workers in turn were incentivized to do a good job and gave feedback like ideas on how to improve efficiency, e.g. build an internal railroad to carry bricks up as they got higher and higher in height.

You can build it in a decade or two, and get something close to what you designed. But you can't build it in an year.

Of course car washes are a case where I could see someone building one to keep their crews busy between other better paying jobs. Thus have lots of stops as other projects come in. there isn't much investment sitting and there is value to a contractor to keep their crews busy (read paid!) even when there is no other work. I could see a car wash company agreeing to a build this over 2 years for a discount even though there are only a few months of work - for both it could be financially beneficial.