Stamped certified structural analysis?

[Alex Ballas]

I am looking at a property that has this requirement:

Purchaser is responsible for providing a letter of corrections and stamped certified structural analysis from a certified engineer prior to performing any repairs or improvements to the property. 

What does this imply? Is there a major structural issue or a foundation issue? It is a SFH bank owned and foreclosed, but a twin but I'm not sure if someone is living in the other side.

thanks in advance, you folks have been really helpful.