I am referring to more than one a year.

Talk with a mortgage broker.3)  No4)  I'll refer you back to #2 again. 

@Russell Brazil But specifically which “service” are you referring to?

Most passive investments in real estate are referred to as syndications and include a sponsor (who brings the opportunity) and investors who place their capital into the deal.

RS3 is two-flat only but that only refers to the number of stories of the building and not unit configuration.https://www.chicago.gov/city/en/depts/dcd/supp_info/certificate_of_zoningcompliance.html

Is it team-building (CPA etc) references?

Works especially well with military since it’s usually a really tight knit group, friends/co-workers can refer others, steady income stream, and people PCS in and out all the time. 

i think the going rate is about $30/sq.ft with a sink cut-out. i can refer a guy if you'd like. you can also hop onto fb marketplace and shop around there as well. plenty of options.

Im referring to finding an under the radar seller to buy from through my advertising.

3) Anyone have any references for a reputable hvac contractor in chicago that installs high velocity systems such as those mentioned above?