Then I got strapped for time due to having a 2nd child and let a family move in with the agreement that the dad would finish the trim and any small items that were left.

Has anyone bought a model home lease it to the builder for office use until the neighborhood is completed & then sell it?

This is only for 1 item. 

@David WilliamsYes, and we only rent our garages to people storing cars; not personal items.

In box 11a instructions it says specifically “Item 11A.

. $6000/10 year lifespan/12 months in a year=$50 per month for 1 item in a capex budget.

A typical structure would be a two LLC model.

As you and others will not this comes with trade off's and only you can decide if that is right for your model.  

I am based in New England. 30,000 foot view of my model is  to identify underutilized/value add opportunities and raise capital on a deal-by-deal basis (multi-family, industrial and self-storage).

The conservative way to budget Capex reserves is to look at estimated remaining useful life of each item: roof, siding, windows, kitchen, HVAC, water heater, bathroom, fences, gutters, chimney linings/tuckpointing, foundation items, etc, and assigning a replacement cost divided by remaining useful life.