Dive summary:

• There is a growing trend to reuse or redevelop urban sites rather than dig up greenfields for new construction, and the projects can offer contractors unusual challenges and opportunities for creative problem-solving.
• Going where others have gone before can also present some special needs, however, and detailed investigation and planning along with top-notch coordination are well worth their costs.
• When working on established sites, there can be numerous jurisdictions involved, including historic preservation officials whose focus is on the previous use, or the one before that all the ones before that.

From the article:

As a contractor, these projects can be fun in many ways. They are certainly stimulating; maybe too stimulating at times. ...