You have a kick butt deal, if you generate ha;f the cash flow you’re planning on you’ll be ok. So it won’t matter if you forgot things like management fees (or the value and costs of your mistakes if you plan to self manage.) Advertising (photos and listings.) turn over costs, snow removal, and those kind of things. The big deals will be vacancy, capex and appliances. (3 water heaters, stoves, fridges, microwaves?, washers? dryers?, dishwashers? ac units, furnaces, etc etc.) best case you only have 15 of those, not 21 or 27. With an average life spans of 6 years you’ve got 2-3 per year. I know, you have “repairs”already. But that’s going to be toilets, faucets, leaks, garage doors, etc etc.
I’m not saying you have a bad deal, or I wouldn’t buy it if it was located somewhere warmer without income tax. (Ps. Subtract income tax and tax prep from your cash flow. :-)) Run 2025 through quicken and at the end of the year you’ll have real numbers and you can come back to this post and see how close you were. Hopefully you’ve increased rents and your above expectations.