(Portland, OR) -- About 20 people, including three city councilors, chiefs of staff, and housing officials, are heading to Vienna this week on a taxpayer-funded trip to study social housing. Councilors Candace Avalos, Jamie Dunphy, and Mitch Green say the visit will give them firsthand insight into Vienna's model, where 60-percent of residents live in government or nonprofit-owned housing with affordable rents. The trip follows a resolution passed in April to explore social housing options in Portland, with a report due next spring. Supporters argue the lessons could help address affordability and homelessness, while critics question the use of public money.