When would you want/need as-built surveys done during the investment process?

[Thai Chau]

Admittedly, this is a self-serving question, as my "9-5" is operating a nationwide architectural as-built company. But I'm genuinely curious and wanting to prepare for when it comes time for my own CRE investments. This topic is just one of a few hundred questions I'll have.

I typically work on projects that are ready to proceed into the tenant improvement phase and need architectural design drawings. In other cases, are architectural surveys/as-built floor plans needed during due-diligence phase, just prior to closing on a deal, for insurance policy purposes, or anything else you can list? 

Thank you ahead of time for taking a moment to respond.