Chicago · 2 to 4 unit buildings
You can learn to spot a good deal in one evening. Not a feeling, not a hunch. A 2-flat, the building most of America calls a duplex, lives or dies on four numbers, and all four are numbers you can find yourself.
Here they are: what both units rent for, what the building costs to run, what the loan costs each month, and what is left over. That is the whole shape. Everything else on the listing is decoration.
Most people shop by price. Price is just the number on the sign. Rent is the number that pays for the building, month after month, for as long as you own it.
That is why a cheap building is not always cheap. Some listings show rents higher than those units can really get, and the deal only works if you believe them. So don't take the listing's word for it. Look up what similar apartments within a few blocks actually rent for, and run your numbers on those. Ten minutes on any rental site gets you there.
The flip side is where deals hide. A building priced fair, with big sunny units near the train that rent strong, can beat the "bargain" a mile away.
Costs to run the building: property taxes, insurance, water, any heat or common lights you pay, plus something set aside for repairs and for the weeks a unit sits empty. Listings tend to leave out those last two. You shouldn't.
The loan: if you plan to live in one unit, you can put as little as 5% down. On a $600,000 building that is $30,000 down, before closing costs. A lender can turn that into a real monthly payment for you in about five minutes.
What is left: add up the rent, subtract the costs and the payment. If you will live in one unit, here is the part nobody explains. Don't compare your share of the payment to zero. Compare it to the rent you pay now. If your share is close to your current rent, the building is already working. And that is before the quiet number: every month, your tenant's rent pays down your loan. It is the closest thing real estate has to a 401K employer match.
You do not need a secret off market deal. After 20+ years of buying rentals and flipping properties, here is how we put it: generally, off market properties come with a problem, a problem that no one is going to pay you for. The good deals mostly sit right on the open market, wearing bad photos and 1970s kitchens, while everyone scrolls past.
That is also where the upside lives. A 2-flat where each unit has one bathroom, plus room to add a second, is the kind of building we get excited about. The highest return renovation in Chicago, after 20+ years of doing them, is adding a second bathroom. Plenty of buyers walk right past buildings that make it easy.
If you want to see the shape for yourself, put a real Chicago address into our deal analyzer. It shows you what the units would rent for, what the building costs to run, and what would be left each month. Run it on five buildings you find on Zillow and the good one starts to jump out at you. That is the goal. We would rather teach you to see it yourself than have you take anyone's word for it, ours included.
And you don't have to run your first one alone. Get in touch anytime. You don't need to know exactly what you want yet, most people who reach out don't. We'll go from there.