Questar Properties Inc. CEO Stephen M. Gorn said financing should not be a problem for his company's 44-story apartment tower and groundbreaking could come before the end of the year. The building would be the first entry in the "ultra-luxury" category of high-rise apartments in Baltimore, which has raised eyebrows among some real estate industry veterans because it's an untested market. Bozzuto Group has been successful with high-end developments such as Union Wharf, but the company has not attempted…