I have been looking at Cost Segrigation and 100% bonus depreication.Has anyone ever done one for a single family home portfolio?

If you used DIY cost seg software, then you pushed it too far.

Quote from @Jeff Mooney: Hey BP,I’m in talks with a potential seller who owns a 3 bed / 2 bath single-family rental.

Renovations are costing more and more these days, so you'll have to decrease your offer price to accommodate the needed renovations.

Does anyone know what the per square foot cost is to build new single family homes either builder-grade or mid-grade for the Northeast Florida/Jacksonville market? 

The layout allows for an easy addition over the garage, potentially adding 2 unitsThese units could generate approximately $36,000/year at $1,500/month rent per unitFinancial Overview & Valuation: At current income and stabilized rents, the property offers a 6.5% cap rate on a $700,000 valuationRenovations and addition of two units would cost approximately $350,000Post-renovation, the ARV (After Repair Value) is projected at $1.4 million, with the potential to double the annual revenueRun Your NumbersWith the current market pricing in the mid-$600,000s and being on the market for only 30 days, 5000 Florence Ave represents an exceptional value and scaleable opportunity.

Guidelines to follow:Only buy in low-cost markets if your costs stay under 75% even after paying for two major capital improvements, such as a new roof and a new water service line.Make sure you can eliminate all obvious safety and health hazards—like broken sidewalks, missing railings, lead paint, or poor lighting.

How much does the house cost?

If the place is a converted single family or a section 8 lease then you would eat that cost.

“beware of requirements for additional title insurance beyond the cos of the property and the buyer named on policy.”To clarify, lender's title insurance covers the amount of the loan, not the cost of the property.