They also are slow to report leaks which runs the bill up even further.Even if you get less rent per month on the lease your net is usually higher with tenant paid utility if at all possible.Do not cut utilities off.

This could be a house built within the last 5-10 years or a recent rehabbed house (pay attention to the roof). 

The building I am looking to acquire is a 6500 sq ft block construction shingle roof building built in the 1980s, with a total of 42 garage doors (21  10x30 units with doors on either side so they can be subdivided into 2 units).

Most of the older homes were over engineered however they also are more likely to have been abused meaning too many layers of siding or roofing or crappy electrical or plumbing splices here and there.

His building needs a roof, air conditioners & interior renovation.

If you look at 8 houses, and you are reviewing all at the end of the day, you can tell where one ends and the next begins,  We also make sure not to take too many pictures. 8 max of only the high ticket items, roof, windows, kitchen, electric panel, kitchen, baths, furnace, ac, front and back, andything unusual,  i dont want a picture with a hole in drywall that will cost 25.00 to fix, no pictures of carpet of paint, or things we will replace in every house.... always a couple photos for perspective. 

I mean, the places I recently looked at are lower end neighborhoods are $550000 with foundation and roof damage, where the rents would barely cover the mortgage, these would be investment only properties.

While I could have replaced a leaking component in my 12 year old HVAC system I decided to replace the system with a more efficient, quieter and reliable (I hope) new installation. 

The roof is tarped.

I doubt repairs are only 2,880 per door with 104 doors.Carpet and paint alone depending on unit sq ft size would eat up 2k a door.I haven't even gotten to  mechanicals or the exterior parking lot, roof, windows, water and sewer laterals, and  a host of other issues depending on when the property was built.You can have big rewards but huge losses if you do not have the experience.