., Inspect Mechanical items, Water Heater Age, Roof, and Appliances. 

If you hired a roofer to put on a roof and 6 months later the gutters leak do you blame the roofer?!?

The other risk is dishwashers leak when they are not working, so in the end you are not saving anything.

Rents shot through the roof as the demand exploded!     

It also has a large flat upper roof area, although not sure if it could be used for something or not. 

How old is your roof?  

I have my contractor walk through it instead of a home inspection.Once you do a few, you learn to expect pipe bursts and leaks, sewer backups, etc so just factor those into your rehab estimate.The big question if you are looking to wholesale is -(a) I believe HUD has a restriction on the deed saying you cannot flip/wholesale it.

Example, the tenant has a guest over and there is a leak that I was not made aware of.

., plumbing, electrical, roofing) and try and estimate the costs for each. 

Some things to consider are the age and condition of major systems like the roof, HVAC, and plumbing.