My average service call is $150.

If you see many sales without the sq ft then see what the average size has been. 

First of all, if the average daily stay is less than 7 days, then it is treated as a commercial property, not residential by the IRS, which means it's on a 39 year depreciation schedule, not 27.5.

@Ian WalshThat SEEMS like a good idea, but unless you are starting out with a huge amount of capitol or have really a great team already in place, starting off in a market where the average cost of house in not the best area needing significant work is $700k… not feasible.

Find a few house-hackable duplexes in the area you want to live and get an average asking price. 

I contribute on a dollar cost average basis and has become a sort of forced savings account.

There are a number of MFR buildings in ML - my suggestion is you call pretending to be a possible renter and ask some simple questions such as average tenant age, amenities, etc. to get a feel for your competition. - I have already found some properties by scraping the city real estate records and collecting properties with unpaid taxes.

Have been doing research and I know actual rent here is higher than the average data that is showing.

Our rental market is tight and we have (much) nicer than average rentals that are priced near the top of each "market" (within a couple blocks) where we compete.

.#3 Contact Local Contractors for Labor PricingCall local Subcontractors and get budget pricing for common repairs on your typical rehab project.For example, call a roofer and ask what their average cost per Square of Architectural Asphalt Shingle Roofing would be on a 1,500 sf house, with a 6/12 pitch.Note: Some contractors will be reluctant to share pricing without seeing the property, but tell them you are just looking for a rough budget number you can use on future projects.#4 Compile Your Prices into a Spreadsheet or Estimating SoftwareOnce you start to get a better understanding of Labor and Material costs you will want to store this data into a spreadsheet or software that you can use to help you streamline the estimating process.The Book on Estimating Rehab Costs comes with a spreadsheet that you can use to help you populate your own database of labor pricing and material pricing.