For people with shaky understanding of taxes (and that is at least 95% of BiggerPockets users) your post sounds like:"COST SEGREGATION IS SUPER DUPER COOL AND CREATES TONS OF TAX BENEFITS"And this is what I call dangerous hype, since we love simple formulas like this one and do not bother to invest time in understanding.I will address your specific technical points in a follow-up reply.

I've read a couple formulas within Jamil's "How to Wholesale Real Estate" book, but fix and flip buyers typically would prefer an estimate of costs before looking at a contract and i would like to be able to give them that to add value to potential offers.Any tips/resources are welcome as I have just started my real estate journey.

Does anyone have an excel spreadsheet with the formulas built in that helps calculate long term cash flow, appreciation, and reserves for multiple SFRs? 

I don’t know Stressa, but doing -highlight column-ctrl-C- paste special / values- a SUM() formula, dragged down across the rows you want to sum upevery month or quarter (whatever you’re tracking) seems a lot simpler than learning a whole new platform. 

In my opinion, there is no formula that is workable in areas similar to Punta Gorda.

You can only increase the rents through capital improvements, the town ordinance has a formula for allowable increases based on the cost of the improvements.

I'm sure it's just a formula based on inventory levels and trends, growth rates, etc.. 

No matter where you are sourcing your deals, you need to stick to your formula. 

Is the formula ....Income - mandatory expenses ... ( taxes, insurance)  Income - taxes, insurance and utilities ( if covered in rent)Income - taxes, insurance, utilities and ......????

The formula is pretty simple:Profit = Sale Price - Lot Price - Build Price - Fixed CostsIf you have a desired profit in mind, you can rearrange the formula:Lot Price = Sale Price - Build Price - Fixed Costs - ProfitAnd that will give you the price you can pay for the lot to hit your profit target.Of course, you need to determine your Sale Price, Build Price, Fixed Costs and Profit target -- that's the hard part...