The distinction is that 4 units or less is referred to as residential/small multifamily, and 5+ units is referred to as commercial multifamily.Here are the CO state guidelines for "Motels, Hotels, And Multi-Family Dwellings": https://www.sos.state.co.us/CCR/GenerateRulePdf.do?

The decision simply defined the definition of a "residential/dwelling unit" as it stands vis a vis the Conway Zoning Ordinance. 

Caught in the crossfire between the YIMBYs and the NIMBYs is the contentious topic of ADU or Accessory Dwelling Units.

If this isn't a separate dwelling unit you can't take losses from the rooms / space you are renting and use them to offset non-passive income (Section 280A of the tax code)Rental expenses are limited to the amount of your rental income and the balance of rental expenses is carried forward. 

. $2,500 deductible is pretty much the standard on any dwelling (home or rental) at this point and $5,000 isn't uncommon at all. 

I want to get more into real estate and want to start  BRRRing with new build single and multi family dwellings and I'm needing some guidance with some of the financials of it. 

Example: https://www.akc.org/dog-breeds/best-dogs-for-apartment-dwell...Good renters are good pet owners.

(A) For an accessory dwelling unit described in subparagraph (A) of paragraph (1) of subdivision (e), a local agency, special district, or water corporation shall not require the applicant to install a new or separate utility connection directly between the accessory dwelling unit and the utility or impose a related connection fee or capacity charge, unless the accessory dwelling unit was constructed with a new single-family dwelling. home."

Regarding single-family and modest multi-family dwellings, you're on the right track.

Currently, we have boilers and radiators that we want to remove to create space in the basement for a future conversion into another dwelling unit.