A plan to build condos on some of Midtown's alleys may push ahead this week with the sale of a back lot on L Street. Homeowner Deanna Marquart is close to an agreement to sell 60 feet of her lot to Jeremy Drucker and other developers of an alley housing model called Stitch, the parties announced Monday. Selling the land for $100,000 will allow her to pay off the mortgage on her house at 2216 L St. Marquart, vice president of the Urban Design Alliance, said she also supports the concept. "I think this is the kind of development Sacramento needs," Marquart said. "Sacramento has to become denser in its residential development, and this is really a very desirable way to accomplish that." C