If I had to guess I'd say Len Druskin's tailors probably do a fine job, but I want to make sure I'm not missing something. Thanks!
Minneapolis Denim Alteration
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There is a full-service shoe repair shop next door if you need a repair or shine.
They are 5 minutes south of The Mall of America.
I have yet to get any of my denim altered, I've been perfectly happy to make due with roll/cuff on both my APC & Raliegh, but I like that look and I'm somewhat lazy.
That said, if I were looking:
I'd either call or visit the guys at BlackBlue in St. Paul (it's the only place I've found to buy raw/dry/selvedge denim locally) and they should absolutely be able to point you in the right direction.
Otherwise visit Top Shelf on Lyndale or call and ask for John (he's been tailoring in Minneapolis since before I was born, and his shop does a ton of custom/bespoke work in addition to alterations) he's a great local resource and usually happy to answer questions.
If neither of those works, maybe try calling or stopping by Askov @TBF, though I have found their customer service sorely lacking.