50% required to turn a profit...

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Is this a common experience? I am investigating commercial REI and recently went out looking, but found that I would need at least 50% of a down payment in order be able to afford the mortgage payments. Is this often the case?

I have approximately 100k that I can spend... does that mean I would be limited to a 200k property? If that's the case, perhaps I should start off in residential after all.

-Jonathan