Stream Realty Partners has started work on a senior-living apartment complex in the Austin area as part of a new national building campaign. Dirt started turning in the past few weeks on Solea Cedar Park, a 184-unit community at 1520 Juliette Way, about three miles north of Lakeline Mall. Stream Realty, which is based in Dallas but has an office and significant holdings in Austin, is building six other Solea properties around the country for those 55 and older. Solea Cedar Park will have one- and…