Hey @Joe Hamiter, welcome to BiggerPockets! It's great that you're submitting this analysis for a review despite its negative cash flow. Since I take it you aren't interested in the property as an investment, it implies you're more interested in getting feedback on your process.
I'm only an aspiring investor, not an experienced one, so take what I say with a grain of salt. That said, I feel like the source of these numbers is just as important as the numbers themselves, if not more so. It's hard to gauge the reasonableness of these assumptions without more info on the property (address or at least zip code, age of the property, condition of the various components such as roof and foundation, among other things).
I see you've budgeted $0 for repairs. The interior photos at the end of the report look nice enough, and the property appears to be in decent shape on the inside. However, from what I hear from more experienced investors, there will *always* be something to fix when buying a property, even if the property is fully-occupied and you don't plan on doing any immediate rehabbing. The cabinets, flooring, and paint look to be in good shape from the photos, but what about the roof, foundation, HVAC, water heater, etc.? By budgeting $0 for any up-front repairs, you're banking on the best-case scenario happening and not leaving yourself any margin of safety in case a less-than-best-case scenario happens.
I also see you've budgeted exactly 3.5% for the down-payment. Does that mean you'll be living on-site and getting an FHA loan or similar? If so, have you verified that total closing costs between the loan and the property will be 1.25% of the $280k purchase price? I'm not an expert but that seems low. I'm more used to seeing budgets of around 6-8% of the purchase price.
By the way, awesome to see that you're budgeting 10% for a property manager even though you appear to be planning to live on-site. A lot of the greybeards on this site will tell you that even if you plan to manage the property yourself, if you don't budget for that expense, then you haven't bought an investment- you've bought a job. Depending on the age of the structure, you may want to increase the monthly repairs + cap-ex budget to a combined 15%, maybe even as high as 20% if there's a lot of deferred maintenance. Even if things are in good shape now, they may not be in 5-10 years' time. And the way to make sure you can cover any major surprise expenses is to calculate what your monthly amortization should be for each of the major components of the property, and then put aside that amount. For example, if a new roof would cost $15,000 and last for 30 years (both completely hypothetical numbers), then you'd need to save $41.67/month just for that one item. If it'll only last 20 years, you'd need to save $62.50/month. Same goes for foundation, HVAC, plumbing, electrical, etc.
I don't see any budget for utilities, and given that it's a 4-plex, I'd expect there to be some common areas (hallways, exterior lights, etc.) which would incur utility expenses that you'd be responsible for. In addition, depending on the part of the country in which the property is located, you may need to pay for landscaping, snow removal, etc.
Lastly, another reason why knowing the location is important, is that it might open up alternative income strategies which could turn a negative cash flow deal into a positive one. If the property is in a tourist-friendly area, you might have the option of turning these units into short-term rentals, which could improve the top-line income substantially. If short-term rentals are frowned upon by your city but it's near a hospital or school, you could turn them into medium-term rentals (i.e. longer than 30 days but less than 3-6 months) for travel nurses, visiting professors, etc. Still higher income than what you might get from a normal tenant.
Good luck!