Out of School 3 Years - Letters of Recommendation

<p>I've been out of school for three years and determined that I want to pursue a PhD in accounting. I've received a bachelors and masters from a top 5 business school, have a GMAT score well within the range needed, a clear idea of the research I want to do, but there is a large gap in my application... I do not know how to go about receiving letters of recommendations from professors. I never considered the need to cultivate relationships with professors while in school (2001-2006) and therefore do not have a network to refer to. I do not foresee obtaining admission in the schools I aspire to attend without strong letters of recommendation. Is there any advice on how to gain relationships with professors at this stage in my life? I live in Chicago and have a handful of universities within my near proximity, is it possible to obtain the relationships needed from professors teaching at universities I haven't attended? Any advise would be greatly appreciated.</p>