After a year of back and forth in Harris County District Court, a Houston-based real estate investment company and its former president may have their day in court over claims of "improperly acquiring trade secrets" and "misappropriation of over $1.8 million of investor funds," according to court documents. American Spectrum Realty (NYSE AMEX: AQQ), and William McGrath, the former president of American Spectrum Management Group Inc., a wholly owned subsidiary of American Spectrum Realty, will…