I spoke with a sales rep from the Propstream team and they said that their sale price estimates (for non MLS users) are usually within 1% accuracy, but they didn't provide any way to verify that claim.

If its a matter of repairs to bring the 5 unusable ones up to par, then get an estimate for those repairs and ask for that amount. 

ThanksXiang - Estimating the ARV before purchase can be difficult.

Based on an estimated appraisal of $1.1 - $1.2 million, you could secure a loan of up to $900K (75% LTV).

The wholetail is a smart play, but you should be cleaning the place thoroughly and doing no repairs and then presenting an honest proforma with rents and expenses estimated so investors have a PDF to look through.

Planning for a full renovation from the start is a smart move because it gives you a more realistic view of your budget and timeline, and it allows you to aim for the highest ARV without cutting corners.As you move forward with this flip, make sure to track all your renovation costs closely, since it will help you with more accurate estimates on future deals.

And they estimate the life span of either system to be about 14 years.

My estimate of 15% always ended up being higher, but hey, what's it going to hurt to be more conservative.

It’s especially advantageous that your construction costs are lower due to being a builder, which really boosts the overall profitability of the project.The numbers look strong, especially with a refinance at 5.9% the $24k net after expenses and $12k yearly pay down show a solid return, even with conservative estimates.

For a $300,000 property, this could be $6,000 to $15,000.Mortgage on Rental Property:Loan Amount: $240,000 (assuming 80% financed at 4% interest over 30 years).Monthly Payment: Approximately $1,145.Other Expenses:Property Taxes: Estimated at 1.5% of property value annually ($4,500).Insurance: Estimated at $1,500 annually.Maintenance: Estimated at 1% of property value annually ($3,000).Property Management Fees: Assuming 10% of monthly rental income ($2,400 annually if rent is $2,000 per month).Vacancy and Turnover Costs: 5% of annual rental income ($1,200).Total Initial Investment and Annual Operating ExpensesInitial Investment:Total Borrowed from Equity: $150,000Down Payment for Rental Property: $60,000Closing Costs for Rental Property: $10,500 (average)Total Initial Cash Outlay: $70,500 (initial investment from equity) + $10,500 (closing costs)Annual Operating Expenses:Property Taxes: $4,500Insurance: $1,500Maintenance: $3,000Property Management Fees: $2,400Vacancy and Turnover Costs: $1,200Total Operating Expenses: $12,600 annuallyExpected ReturnRental Income:Assuming $2,000 per month, annual rental income = $24,000.Net Operating Income (NOI):Annual Rental Income: $24,000Minus Annual Operating Expenses: $12,600NOI: $11,400Debt Service:Mortgage Payment on Rental Property: $1,145 monthly, $13,740 annually.Total Debt Service: $13,740 (rental property) + $8,592 (equity loan) = $22,332 annually.Net Cash Flow:NOI: $11,400Minus Debt Service: $22,332Net Cash Flow: -$10,932 annually (negative cash flow initially due to high debt service).Cash-on-Cash ReturnInitial Cash Investment: $70,500Net Cash Flow (first year): -$10,932Cash-on-Cash Return: Not applicable initially due to negative cash flow.Long-Term Appreciation and AdjustmentsProperty Appreciation:Assuming a 3% annual appreciation, the property value could increase by $9,000 annually.Rent Increases:Assuming a 2% annual rent increase, rental income will rise, improving cash flow.