The Ullanlinna Spa and Well Room Company was founded in 1834 and it immediately got down to building a park. Marshland was drained by digging two ponds and transporting landfill to the park. The foundations for the park roads were built from stones. In addition to Finnish conifers and birches, hardwood trees ordered from Germany were planted.
      In the late 1830s, several villas were built in the eastern part of the park and rented out to spa guests.

The tenants were to beautify the surroundings of their houses with plants, but kitchen gardens were prohibited. The Roman Catholic church was built on the northern periphery of the park and consecrated in 1860. In 1886, the city acquired the entire parkland together with its buildings. The villa lots on the eastern side of the park were sold to the tenants. Work was begun to restore the dilapidated park, and what was once a restricted recreational area for the gentry was transformed into a public city park.