I am looking to refinance my  rental property which is a single family home (with an accessory apartment). 

Some examples of data sets you can layer:Property:Property age - used to target older properties for heavier fixersProperty types - SFR, MFR, 5+, all kinds of commercialSize - adding on to the existing structure to add value or accessory dwelling units Location - highly desirable neighborhoods or locations of expertise around specific builds or neighborhood ZoningVacant propertiesOwner-occupied vs. nonowner occupiedPeopleAge of ownersKids in homeSex of ownerIncomeNet worthInterestsMortgageTransfer datesEstimated equityDifferent transfer typesForeclosure activity (NODs, auction sale notices, etc)Then, hopefully, you're taking out people who purchased recently since (probably a waste of marketing dollars), people in foreclosure (different strategy), sites that are listed as vacant. 

Answering services are probably sufficient for doctors and maybe plumbers (the latter's services being more coveted).

Since we don't allow them to paint, screw things into the walls and make other modifications, giving them a neutral backdrop allows them to add the colors they like with accessories.

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@Timmy Fritz if you are occupying a single family home with an "accessory" unit then that is 100% totally fine.  

Not coveting your neighbor's ox in literal reading may not be applicable today - may need some updating to your neighbor's SUV to get the principle.

This is a good place to start.SIZE MATTERS- Only 18% of home buyers still covet a larger than 2600 sq. ft home, unlike the boom years.

Although, you could always wait until their sales telemarketers get down to around $4K for the elite and coveted Mastery program.

A simple approach I use is to buy all the appropriate bath and kitchen accessories at IKEA that will fit the space.