Hello everyone , can someone share what I could use as the square footage multiplier for a medium and heavy rehab in Fairfield county, CT ? 

The loan on this house is $1,200,000.I moved in to my new primary residence by the end of the month.Starting July, my original primary residence was available as a rental and was being shown to prospective tenants.My new tenants signed a lease that began a couple weeks after showing, in July.To calculate my primary residence mortgage interest deductions, i'm using the following formula:650,000 / 2 = $325000 loan from January to June1,200,000 / 2 = $600,000 loan from July to December$750,000 limit / (600,000+325000 total loan value)  = 0.81 multiplier(0.81 * $X first house interest) + (0.81 * $Y second house) = total interest payed i can deduct from my primary residencedoes this look correct?

I don't want to have to paint an entire wall (multiplied by the number of walls that have had nails in them) every time a tenant moves out.

lets call it 15% allocating for closing costs.Appreciation multiplier due to leverage 20X if not counting closing costs. 

It's more about how to multiply the number of homes producing that cashflow.Bless

So you multiply that and well your turn overs are going to be costly. 

Anything bigger or in a nice area, could multiply that amount. 

Multiply that by 8 properties and that adds up quicklyAt this point I've amassed around $150k in debt, I'm spending hours a day trying to find large multifamily properties with nothing to show for it and the whole passive income dream I was sold seems to be a huge lie.

If you are writing off the building, then your would multiply the cost by how much your using for business vs. personal use.

See if you can get a historical expenditure for this utility and take that yearly cost and divide it by the total SF of all units to get a per SF cost of gas for the building, then multiply by the SF of each unit for a monthly cost for each of the 4 units, themselves.