Good question that literally hundreds of market analyst have weighed in on. 

I'm glad to help with info, or potential rental estimates for properties you're thinking about on the STR side.

I also review the insurance costs and try to get a solid estimate of coverage expenses to fine-tune my calculations.

It has sat empty for the last 20 years but the current owners have completely gutted it, have bids from contractors they're willing to share, cost estimates etc. and have had lots of inspections done and so much pre-work with the city and county to figure out what they can and can't do, so a solid plan is already in place.

Not calculating maintenance expense could end up being a nightmare.I always estimate (using either the 50%, 1% or square footage rule) the annual maintenance / first year of maintenance fees for a ALL rental property.

I typically look at Zillow, centimeter and BP to get a full understanding of what rents are in the area to get the best estimate of what a property would rent for. 

Deduct NEW property taxes after you buyDeduct home insurance costsDeduct maintenance percentage, typically 10%Deduct vacancy+tenant nonperformance percentage(we recommend 5% for Class A, 10% Class B, 20% Class C, good luck with Class D)Deduct whatever dollar/percentage of cashflow you wantNow, what you have left over is the amount for debt service.Enter it into a mortgage calculator, with current interest rate for an investment property, to determine your maximum mortgage amount.Divide the mortgage amount by either 75% or 80%, depending on the required down payment percentage - this is your tentative price to offer.If the property needs repairs, you'll want to deduct 110%-120% of the estimated repairs from this amount.Be sure to also research the ARV and make sure it's 10-20% higher than your tentative purchase price.As long as the ARV checks out, this is the purchase price to offer.It is probably significantly below the asking price.

Good afternoon,I am seeking help obtaining market data to calculate the cost of living and estimate rental expenses in the US. 

It is estimated that in 2020 alone $48 Billion was invested in new projects in over 3800 different census tracts.

I only have 1 month of proof of concept so I need at minimum 3 months to get a better estimation.