There are other considerations that may still make it impossible to permit the construction of the building even  if the by-right use permit is obtained and its important to have an architect closely examine how the proposed floor plans will layout to confirm egress &  bedroom windows + localized zoning overlays along with a  number of other factors.

However, when you factor in the HELOC, we have a negative / break-even cash flow (HELOC payments are about 25% of the revenue from both).

You'll be buying in a specific location, subject to local rental regulations and other unique factors.

., including floods, earthquakes, and severe storms.USDA Wildfire Risk to Communities – Offers detailed insights into wildfire risks for homes in specific regions, particularly useful for properties near forests or dry areas.Risk Factor – Analyzes flood, fire, and other climate-related threats for individual properties, giving you a risk score.Climate Check – Delivers property-specific climate risk ratings, covering heat, drought, fire, and floods.Do you consider environmental factors like flood and heat when investing?

Quote from @David Cianci: Quote from @Wale Lawal: @David CianciThe decision to create an LLC for your real estate investments involves various factors, and it's a choice that should align with your specific goals and risk tolerance.

All 16 units would have to remain on same lot/deed forever (so in terms of value, I can’t capitalize on the duplexes being sold to conventional non commercial buyer) think financially it would be nice to phase it out one duplex at a time.

Most focus solely on due on sale clause as the deciding factor. 

And of course they are paid to go pick up materials, or that is factored into their bid.It all comes down to communication between you and your contractor/handyman.As an investor buddy of mine says, I don't let anyone else spend my money.

What factors do you think I should consider to determine if it makes sense?

This is neighborhoodscout stats- since 2000: 287.98% or 5.75% annually which is 10/10 nationally- for last 10 years: 125.30% or 8.46% annually which is 9/10 annuallynot bad but not that impressive until you factor in leverage.