First timer deal analysis questions

[Andy Braun]

Hi BP community,

I'm working on securing my first property and began analyzing a few deals this week. Preface: this might be a B or even C type property as I'm continuing the research, 4-unit, and is 100 or so years old. Using some of the basic assumptions laid out on some of the analysis videos: standard conventional loan 20% down 4.5%, 7% maintenance, 5% vacancy, 10% capex (older building), 9% property management and the deal comes out as a grand slam with over $600 in cash flow/mo and cash on cash of 23%. 

I know that I have to be missing something in the analysis and am looking to the community to see what other factors I need to consider.

Thanks.