Refi after construction.These numbers consider only the portion of costs of the HEL attributable to the land purchase, not the payoff of the HELOC (which we took out to buy the Seaside condo).Cash In:                     $66,166 (Cash, 1 year of debt service of HEL, debt service of const. loan, furnishing)Amount Financed:      $548,000 (home equity loan + construction loan + closing costs)Total Cost of build:     $614,166ARV:                               $850,000 (or rather "after construction value")Refi                                $637,500 (75% of value + closing costs)                                        Cash Out                       $89,500New payment             $4500/month (54,000/year)Estimated Cash Flow (pre-tax numbers, so actual mileage may vary)airBNB year 1:            $70,000     (net income $16,000)airBNB year 2:            $100,000   (net income $46,000)airBNB year3+:           $120,000   (net income $66,000)ROI (construction year):    0ROI Year 1 of STR:              24.2% ROI Year 2 of STR:              69.5% ROI Year 3+ of STR:            99.7% Did I calculate these ROI numbers right? 

Contract negotiation/formulation, title company coordination, pulling comparable sales reports from their local Multiple Listing Service, rent estimation (if a rental property), neighborhood information (more important for out of state investors), and an honest/informed second opinion.

These involve additional costs.I am not saying that there definitely is negative cash flow, but I will say not including known expenses is providing a misleading cash flow estimate.  

My next step is to get estimate how much it will be to move the house and talk to city. 

Your estimate seems low, but even at that cost, it will not add that value.  

They usually are high on estimated ARV and low on estimated upgrade costs.San Diego RE investing returns come from: appreciation, value adds, equity paydown.Value adds:Rehab: Standard BRRRRADU: have become popular in last 2 years due to changing CA ADU regulations. 

We can buy the house for maybe 125k and he estimates 120k in renovations.

Through this journey, I’ve built strong relationships and developed valuable expertise in:Researching micromarkets and identifying comparables, potencial Accurately estimating construction or remodeling costs.Securing fast and reliable financing through partnerships with two top hard money lenders in Texas, offering competitive rates.I’m on this platform to connect with capital partners who are seeking an annual ROI of 12%-15%.

Or do you have an estimate of the amount of money you can invest in a property?

The financial and social extent of this disaster (initially estimated at $50B) is underestimated by at least 5-10X.