Watch out for plumbing or electrical that hasn't been updated. 

We rescinded an offer on a different property because it need new roof, new water heater, new furnace, new electrical wiring, there was some unknown plumbing back ups and leaks.The owner would not budge on the price.I just don't want to go forward with this other property and have some major expensive repairs going in the first year.

Needs new electrical service to home and plumbing throughout house.

I also have experience in hands on rehabbing myself, I've personally done electrical, plumbing, framing, sheetrock, paint, fabricating, landscaping, mechanical, carpet, flooring, roofing, demo, etc.

However, it turns out the property is now marked for plumbing, mechanical and electrical violations.

As far as plumbing, we just have an upstairs sink that tends to leak.

That said I just did a reno (same building, no architect), ended up replacing all the plumbing in unit to bring it to code - not be something an architect would be able to predict.

Does this also include the building structure and building systems like electrical, plumbing, and HVAC? 

On one of the houses, he pulled a building permit for plumbing, and that permit has expired before the bathrooms were finished so inspector did not do the inspection.I have another guy that can finish out the job, but he is not a GC and cannot pull permits.

They just want people living in safe places, with proper egress, Proper ceiling height, and electric and plumbing installed properly.