Considering a 4-plex, would you do it?

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Hey all! I'm considering purchasing a 4-plex. It's an older apartment building, in a nice part of town, good school districts. It's listed for around $356,000. I would put down 25%. Mortgage would be around $1300/month. We asked for the financials on the property, this is the "best year." Each unit supposedly rents for 875-1000 per month, which makes me think they typically operate at 1 unit being empty or being turned over. This gives a much better view of what the potential income/expenses is than I had come up with in my analysis. If I had the same success they did, and had the net income of $20,254.00, I would still have to pay the mortgage, which would be approximately $16,200 for the year ($1350 x 12), which nets me around $4,000 for the year, or $333 per month. 

For adding value, the units do not come with washers and driers, I could add those. But otherwise there's not a whole lot to be done. Could bring all rent up to $1000. But man, this is razor thin margins. How are people making money in this game??? Would you do this deal? Spend $89,000 down payment, plus closing costs, to make $333 per month?