A vacant lot within walking distance of Gonzaga University soon will be the site of a four-story retail and apartment building geared toward graduate students and young professionals. The 88,000-square-foot Matilda Building, 1002 N. Hamilton St., will feature three floors of upscale apartments above one floor of retail spaces. Developer Kent Hull said one business, an unnamed but “pretty well-known” coffee shop, intends to sign a lease for 5,000 square feet.