Further you should look at how many nights you were occupied across all units here and divide $25,000 by that number.

Divide that by 12 months. 

For property taxes I took the sale price of the property times 1.5%, then divided that by 12 months.

  $200/month divides into the $100K initial negative equals 500 months to recover the initial negative equity.Let's double the cash flow to $400/month.  250 months to recover the initial negative equity so over 20 years.Let's reduce the negative equity position to $50K (which likely is less realistic than expecting $400/month cash flow at that rent point), you are at over 10 years to recover the initial equity position.Now let's do it with all cash, no financing.The 50% rule state $900/month cash flow.  900 * 12/200K = $5.4% or about half of lifetime return of S&P 500, or what can almost be achieved with a zero work, zero risk CD.I see no way that someone who understands the numbers will call this a good investment.Note just because an investment is better than most other investments in a market does not imply something is a good investment. 

How to calculate DSCR is NOI divided by Annual Debt Service. 

Cash on cash describes how much cash a rental property is putting in your pocket on an annual basis divided by the cash you took out of your pocket to buy it. 

But my solution in your case would be to frame out a dividing wall of 2x4s and either drywall or if the basement is prone to taking on water then I’d look for something waterproof as opposed to the drywall.

You just divide the monthly rent by the purchase price.

Your basis in the entire property will be divided into each of the 6 units. 

If I'm understanding correctly this means I can't build an ADU, but if I can divide the land more evenly between the plots then maybe two single families are possible.Exciting stuff!