I invest in both US and AU real Estate. 

I was told once that Gordon Heights has more registered sex offenders than registered voters.  

But at this point, I have no idea what the rehab costs would be, or what a fair offer on the house would be.The numbers I know:A similarly-sized empty lot in the same neighborhood can be bought from the city for just under $17,000.Rents in the neighborhood have a "u-shaped" graph: $600-800/mo for the crappy ones, and $1300+ for the recently-renovated ones.SFHs in the area sell for $120k-200k un-renovated, or $250k-350k renovated. 

Not sure what you mean by level of technology but I have used theses sites to research a city/county City DataWest Allis, Wisconsin (WI 53227) profile: population, maps, real estate, averages, homes, statistics, relocation, travel, jobs, hospitals, schools, crime, moving, houses, news, sex offenders (city-data.com)andWest Allis, WI Real Estate Market Data - NeighborhoodScout

I am a property investor in both the AU and US markets. 

As long as you're not discriminating against someone based on race, color, religion, sex, national origin, familial status or handicap, you won't run afoul of the federal Fair Housing laws.

Au contraire!!

Im from NZ also but reside in Perth AU.

Title VIII of the Civil Rights Act of 1968, as amended, prohibits discrimination in the sale, rental, and financing of dwellings, and in other housing-related transactions, based on race, color, national origin, religion, sex, familial status (including children under the age of 18 living with parents of legal custodians, pregnant women, and people securing custody of children under the age of 18), and handicap (disability).Better take a landlord class and get your act together.

McIntire is a Partner for McIntire & Au, LLC.