It often depends on the definition of the zoning classifications within each city; based on the below info, I'm not sure which zoning classification a duplex would fall into.

D Class stuff and you'll run into lots of trouble and fall into what I call the "return trap". 

Here's some info about what's happening in Metro Detroit recently, By the way, no one else is committed enough to gather & share this type of info about their marketplace with supporting proof.Volkswagen Scout Brand investing $11M in Detroit, 200 new jobshttps://www.teslarati.com/volkswagen-scout-11-million-detroit-investment/Hotel Added to Hudson Site, total over $1.4Bhttps://www.detroitnews.com/story/business/2023/11/02/hudsons-site-hotel-plans-move-ahead-as-city-issues-permit/71426631007/Detroit west side Dexter Neighborhood Receives $21.5Mhttps://www.clickondetroit.com/news/local/2023/11/01/neighborhood-on-detroits-west-side-receives-more-than-215m-in-investments/Norway’s Nel Hydron investing $400M, 517 new jobshttps://businessfacilities.com/nel-hydrogen-will-build-400m-gigafactory-in-southeast-michigan#:~:text=In%20Southeast%20Michigan-,Nel%20Hydrogen%20Will%20Build%20%24400M%20Gigafactory%20In%20Southeast%20Michigan,green%20hydrogen%20using%20electrolyzer%20technology.Chase invests $200M in Detroithttps://www.axios.com/2023/09/28/detroit-rebound-jp-morgan-investmentGilbert Foundation invests $439M in Detroithttps://www.henryfordmsu.org/news/september-2023/gilbert-family-foundation-announces-nick-gilbert-neurofibromatosis-research-instituteBollinger Motors investing $44M, 237 new jobshttps://michauto.org/bollinger-motors-plans-44m-metro-detroit-investment/15 New Detroit Developments to Be Excited Abouthttps://www.metrotimes.com/detroit/15-new-detroit-developments-to-be-excited-about-photos/Slideshow/32734721/32735392BorgWarner Investing $20.6M, 186 new jobshttps://www.crainsdetroit.com/auto-suppliers/borgwarner-invest-206-million-create-186-jobs3 International Companies Choose Detroithttps://www.detroitregionalpartnership.com/international-investment-comes-to-detroit-region/District Detroit $1.5B Development, 12,000 temp jobs, 6,000 new jobshttps://www.detroitnews.com/story/business/2022/11/15/district-detroit-1-5b-development-to-include-housing-retail-hotels/69649853007/6 New Residential Developments in Detroithttps://detroitisit.com/6-new-residential-developments-in-detroit-to-know-about/$2.5B New Center by Henry Ford Health, Pistons owner and Michigan State Universityhttps://www.clickondetroit.com/news/local/2023/02/08/incredible-investment-in-our-city-25b-detroit-neighborhood-redevelopment-to-begin-in-2024/$300M Huntington Place Renovations & New Detroit Hotel https://www.crainsdetroit.com/real-estate/huntington-place-renovations-new-hotel-deal-reachedYou'll also want to be careful about falling for the misleading "let me help you by sharing my story" posts of members like Joseph Bui, who are really just trying to entice you to contact them so they can sell you properties.We are very open that we're here to get people interested in our Detroit market to do win-win transactions:)

The remember that all liens will fall off after the foreclosure, however IRS liens have a 4 month redemption, this is a something to make note of because you can’t remodel anything until the redemption period.

This includes allowing the seller to foreclose on myself and my team should we ever fall behind in payments, which we will not.

At least for LA, SF, and SD, the whole city just about falls into those categories in some regard unless you are way out in newly developed suburbs or something.In my time around LA, there are definitely some places I would avoid and some places I would prefer to own an MTR.

I can see those that have really never gotten a loan fall for this. 

They won’t even cover me if someone slips and falls inside the house, which doesn’t make sense because what does that have to do with the jacuzzi.

These are all currently in my name, i manage the properties myself and have no due on sale clauses on the mortgages i have on some of the properties.After I purchased the 5th this past fall i started to think about how to more effectively run the properties.

“If you don't design your own life plan, chances are you'll fall into someone else's plan.