I always assumed it was a heat pump since those are very prevalent in this area. 

If you're in the first-ring suburbs, Edina Realty seems to be the most prevalent outside of the nationally recognized names - Coldwell, Keller Williams, etc.

It is more prevalent in low income areas, true, but it still happens with luxury homes.

The typical Chicago "two flat" is not as prevalent up your way.  

Knob and Tube wiring is prevalent in Worcester in a couple of the neighborhoods, but not so much in others.

Avoid class C properties and properties in economically declining areas.Declining areas are more prevalent in the Midwest - the so called rust belt towns.

Adam is right, during the last correction defaults on small multifamily were 10X more prevalent than those of 50+ units.Your investment is more protected when it has more units / possible tenants.

Run your analysis again and then use the resulting NOI and prevalent Cap Rate to determine what you think a good price would be.

Hosts know that in order to compete, we have to step up our games and provide quality that was not as prevalent in the past and this has caused the older and less polished listings to struggle.I am not denying that many hosts are struggling, many are but this has more to do with the increased supply and increased quality of the supply making it harder for mediocre listings to compete and attract bookings than it is a reflection on a "bust" market.The market is correcting, destroying old and stale supply.

You should be able to Google this and/or search the BP forums for information on this.Many people believe that as ADUs get more prevalent the financing rules will change to accommodate the ADUs.Good luck