Juan:
I have a couple of local/semi local dealers who have been successfully working out of their homes for many, many, many years.
-Acoustic Image (Elliot Midwood sp?), Studio City, CA
-Gene Rubin Audio, Ventura, CA
Not certain about Gene Rubin, but seem to recall Elliot having a retail space a long time ago.
Elliot (who's a 15 minute drive away) home demo room is awesome (only spoke to Gene once and never visited as I have not driven highway/freeway for 20+ years - except in a few emergency situations).
Anyway, just to say that this business plan can succeed, plus you have the outside work for additional income.
Commercial rent is insane here (private as well), no idea what it's like in MN.
I grew up and lived in Iowa until 1977 (Des Moines/Iowa City) and visited Minneapolis/St. Paul on numerous occasions during that time (especially after I35 was completed - lot's of great/memorable concerts and a much nicer drive than that to the Crown in Chicago:-).
DeKay