There are all kinds of stuff behind those wall that could be waiting to uncover themselves.

Usually only one set of utilities. mine is german duplex with very exotic in-house a strong wood cabinet, the first time I saw it i remember the movie back in 1934 in berlin lol milwaukee is so facsinating.if you can write a thread these days about milwaukee real estate history between those german duplex, polish flat that would be wonderful, want to see how the layout looks likemine is originally owned by first and second generation german immigrant, the owner is the second son, like to play bridge/chess in the house and passed a way sometime five ten years ago ........ 

Another fine example: we have a house that many years ago someone decided to tear out the front wall, put in a second wall further inside the house, so that they could have a full front porch.

AND, I would require that there be a smoke detector in the garage that is "connected" or "talks to" the smoke detectors in the house so that if a fire does break out in the garage, the tenants can get out out before the house burns down.I would also make sure that there is a sufficient fire wall between the garage and the rest of the house.

There were hand-built, wood-framed, walls in two of the units creating pseudo-bedrooms for the additional occupants.

The 400k$ quote is for a quite extensive whole house remodel (moving walls, windows, openings, expanding footprint and +1 bath, +1bed) and includes design, consultants and permits.

But also... sagging roof and some structure, hollow walls= no insulation or anything!

However once I got it going it has been great and I learned so much.The perfect deals of buying a duplex for 40k and then discovering it actually a triplex by putting  a 500$ wall and door in, then the value is 400k cash flowing 3k a month with 41k isn’t real life.

Quote from @Jaron Walling: @Dustin Owens Why are you selling your home?

Modest development as @Jaron Walling mentioned.