For an $800k house you may need to multiply that monthly property tax number by 5.

So you would take 88% (the LTC number you were using) and multiply it by the $160k. 0.88 x 160,000 = $140,800.

This is a general rule to start at, and used for average priced homes.You take the ARV of the house and multiply it by 70%.

You're doing this the traditional way and for things like an investment loan on a property, they will charge more interest on youDSCR- this is typically used for commercial due to the NOI and that's because when the bank will underwrite the property it's more focused on how much money the property will make and typically they'd go for at least a 1.25 multiplier AT LEAST or more due to the current market conditions

County tax appraisal information is an acceptable way to find out the ratio of the land value to the improvement (building) value, and then you can multiply the original purchase price by that ratio to get a reasonable estimate of the land and improvement values. 

Let them multiply your efforts, rather than you trying to compete with them.

Return On Investment or ROI in real estate is calculated very simply: ($ X 12) / Total Investment, where $ is the monthly rent multiplied by 12 months and all divided by the total amount spent on the investment.

So from my research I have done and the information I have gathered from a few brokers whom specialize in this area, the comps are averaging about $1,440/sqft.Property price: $2,900,000Development cost: $1,950,000 (estimate of $250/sqft multiplied by 7800 sqft home)Total estimated investment: $4,850,000 Estimated sale price of: $7,900,000 ($1,440/average sale multiplied by 5500 sqft living space)$7,900,000 Estimated Sale Price$4,850,000 Estimated total investment$3,050,000 projected gross profitafter paying interest on borrowed money, taxes, commission to broker and other surprise expense, estimated projected Net profit of 1MM- 1.5MM My question now is I have close to 30% of 5MM for the down payment for this development, what would be the best way or any way if there is one at all to raise the other 70-75% to do this project.

There is still nothing that lets them know that there is $75k (or whatever amount) of value out in the ether working and multiplying...

So you would calculate how much rent is per day in your rental, and multiply by how many days the unit is not available and reduce the rent by that much for this month.