Re-piped the whole property, built a laundry room, expanded the pool deck and added pavers, refenced the property, re-built 2 exterior staircases, re-landscaped, and put in all new cabinets, granite, appliances, LVP flooring, lights, doors, blinds, etc.What was the outcome?

For example, doing the kitchen,paint and floors in the 2 months before moving in and then moving to bathroom renovations or adding a master suite addition while living in the property.Depending on you jurisdiction and capital you can use the value add house hack to even add an adu to increase the density. 

I have looked into multiple properties that have finished rooms but and a bathroom on each floor.

Our policies clearly state 4 PM check in, and I couldn't accommodate an early check in anyway because the previous guests were still there and had until 10 AM to check out, then the house needed cleaning.

I personally do not care for black cabinets and black gleam flooring.

I've done camera work and the plumber said they see light root growth, but I could clean the pipes annually to prevent growth and back ups.

After some time we are able to renovate with new flooring, new paint, new light fixtures, new bathroom fixtures and vanity, new kitchen countertops, and painting the kitchen cabinets and new cabinet hardware for about $7500 on a 1/1 or 2/1 apartment.

And how are you cleaning in 10 minutes???

Sure, I've had to replace a roof and I've redone floors twice.

"Modular" structures are allowed to get a CofO in the US if they're IBC/IRC compliant -- which requires someone to do code compliance checks on the factory floor.