# of part-time real estate investors in US?

[Stewart McMillan]

Has anybody seen any data on the # of part-time real estate investors there are in the US? By part-time REIs I mean folks who have a separate full-time jobs with less than $5 million in property owned (and less than $2 million in accumulated equity across all properties owned).

I'm considering a side project building some software that can help with finances and investment decision-making for people with not much training in accounting or finance, so I'm interested in what the size of the potential market for that kind of product might be.

Thanks BP crew!