The old building is set to be converted into a new kiosk café, three separate gender-neutral toilets, and a disabled access toilet.
The work is expected to take around three months and the council is aiming for the café and toilets to be open before the end of the summer.
Fencing will shortly be going up around the building, however people will still be able to access the playground and fountain area while the work is being done.
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Approved by the City Environment, South Downs & The Sea Committee last November, the work will breathe new life into the period building.
It will also mean toilets for an area without them since we were forced to close facilities at The Level in 2022 because of significant issues with the building.
Councillor Tim Rowkins, Cabinet Member for Net Zero and Environmental Services, said: "This is very exciting news. The Level is a very popular space and families with children, the elderly and people with disabilities need to know there are good public toilets nearby.
"By giving the MacLaren Pavilion a new lease of life, we can provide excellent facilities as well as a new kiosk café for people to enjoy.
"Improving Brighton & Hove’s public toilets is one of our top priorities and we have continued to invest in facilities, including reopening the Royal Pavilion Gardens toilets last month. We’ve done some great work so far, but we won't stop until we have public toilet facilities the city can be proud of and accessible to all our residents and visitors."
