A good way to forecast rental demand is to also look at economic data from FRED - population growth over the past few years, median housing income, job growth, crime rate, schools, ethnicity mix, etc.

You may also want to broaden your pallet and experiment with certain ethnic dishes.  

That LA case where a landlord being penalized for not wanting to rent to someone who doesn't speak English as ethnic and country of origin biased. 

They are not REALLY oversea people, they are US citizens/greencard holders but they are ethnically minorities, English is not first language and they weren’t born and raised here.

Sure, take 10,000 homes bought by investors, and do regression analysis that gives me an indication of variables that are common, like geographic area, home value, home owner's age, income level, political persuasion, gender, ethnicity, or anything else!

I know I'm over simplifying, it doesn't seem that hard I would imagine @Jay Hinrichs saying "Questionable ethnics is like ice in your drink at a burger flipper, the higher the volume the more ice they put in your soda, and will use words like *cooling optimization* to defend the scant amount of soda in MY DRINK!" 

Wrap tapestries and ethnIc drapery around the windows and doors .

Remember a few years ago HUD decided because certain ethnic groups have higher rates of felonies than other groups, it is a fair housing violation for us to use felony status as a screening criteria.

Neighborhood is rough in an ethnically diverse section, but property price and rents seemed good.

I'm not talking about race/ethnicity/social class.