Residents of a mobile home park in Petaluma are protesting a possible rent hike and closure. About 100 protesters gathered outside of the Youngstown Mobile Home Park on North McDowell Boulevard, denouncing the moves of the owners. Those moves have included converting the park from seniors-only to all-ages residents, threatening to close the park, and trying to raise rents by more than $900 a month. Residents from Little Woods Mobile Villa also joined them as they face similar problems. The owner of the park, Three Pillar Communities, operates more than 60 mobile home parks in 14 states.