While Houston’s office sector remains in the doldrums, multifamily is struggling and has seen better days, retail remains hot. One of the most active players – if not the most active player — in the Houston retail scene is Alan Hasssenflu. In a short span of time, Hassenflu has become one of the nation’s premier retail real estate developers. His firm, Fidelis Realty Partners, owns and manages or has under development or pre-development more than 10 million square feet in nine cities and three states.