But if I want to use ROE as a measurement of the property's general performance and to help inform potential buy/sell decisions, using Cash Flow in the numerator doesn't make a lot of sense.

In addition, UCC codes are a lot more stringent than the simple 1-2 family IRC codes.

He went through the mistakes and created preventative measures so that I don't have to. 

Everyone has their own reason..To expand on the new construction purchase as well, I have spoken with some builders and they are very stringent about selling for or above list price as they have the current leverage in the seller's market to keep prices up.

Also seeking information regarding how new-build ADUs tend to align with the stringent Miami-Dade building code, in terms of structure type, impact windows etc. 

If you want an added measure of re assurance, establish a relationship with a property manager that is willing to take a look at it and give their opinion of the rental potential. 

All of the backyard/fun stuff is great but IMO you will get the most measurable ROI from adding another bedroom.

MEASURE doorways for entry and rooms before buying.

Pre Fab countertops are great for a kitchen where there are no special cabinets or weird measurements, just a basic straight run of cabinets.

Let me try to share insight from the lens of a resident engineer overseeing a bridge construction.We work off a detail plan and collect quantities, inspect, count, and measure materials when they arrive on site, and try to take advantage of season product discounts.We always perform and independent check on the contractor.