Via Studio City, a 15-unit apartment building located in Studio City, has changed hands for $6.3 million, or $420,000 per unit.The 15-unit structure at 4100 Whitsett Ave. was sold in an all-cash deal, which closed escrow in a fortnight.Rick Raymundo, a broker with Calabasas-based Marcus & Millichap Inc., represented the buyer as well as the seller. Both parties were private LLCs.Comparable transactions in the same general submarket include the 17-unit 10814-10818 Blix St. in North Hollywood, which sold in December for $4.5 million, or $264,705 per unit; and 6015 Woodman Ave., a 14-unit complex in Valley Glen, which sold in November for $5.45 million, or $391,285 per unit.