One of the biggest challenges is keeping the bathroom as carefree as possible.

Very few updates were necessary for the property because it was a new build, yet we made interior updates as all dimmer lights and updated the bathroom tub.

I do not individually allocate for the small items but the maintenance/cap ex worksheet contained the reasonable costly stuff like you mentioned then had an entry for all of the small items (bathroom lights in some of my locations do not last 10 years). 

I suggest the first property should be turnkey, the second should be a light rehab (finish basement, redo bathroom).

Bathroom RemodelA modernized bathroom with new vanities, high-end fixtures, tile work, and updated plumbing features can greatly increase a home's value.

If he's only doing bathroom remodels, that would make sense to not bother.

That led to uncovering significant water damage throughout the first-floor unit's bathroom, forcing an immediate renovation.

The property is a 3 bedroom, 2 bath (one of the rooms is the master with its bathroom and access to go outside), with a separate garage and an unfinished garage unit.

Upon inspection, the pest control company found holes in the walls under the kitchen and bathroom sinks.

Is a shared bathroom common or should we add more?