Nobody knows what the hell “corporate leasing” and “alternative rental arrangements” means.

Tax and Legal ConsiderationsUnderstand the tax implications and legal responsibilities associated with rental income.

Most (not all) HELOCs require that the property is titled to an individual (not LLC) and are full doc, meaning your employment history, income, DTI etc will be factors.

If transferring the property to an LLC, be mindful of the due-on-sale clause, and note that an LLC itself does not offer tax savings unless electing S-Corp status, which is rare for rentals.To maximize tax benefits, consider cost segregation, bonus depreciation, and short-term rental (STR) strategies, which could allow you to offset W-2 income if structured properly.

I'm trying to Figure out how to make this potential deal work.Seller wants to sell but not right away because they still use the house for some income. 

Typically lenders can lend up to 50% of what your gross income is.

If my target would be low income residents, are there any grants, tax credits, or funds available to help me with the conversion? 

Many real estate investors opt for a fix-and-flip loan because they’re relatively easy to obtain: no personal income verification (no DTI requirements), and you can often borrow up to 90% of the purchase price and 100% of the rehab costs.

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? 

Start by deepening your understanding of CRE fundamentals, including net operating income (NOI), cap rates, and lease structures like triple net (NNN).