There is a webcam for Martin's Park, which reveals its complexity. Scroll down.
https://www.boston.gov/departments/parks-and-recreation/martins-park
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Cronin and 150 Seaport contributed monies to Martin's Park. It should not be that difficult for the city to create an endowment for maintenance of this park, securing funds for such from Seaport developers. For example, Harvard is paying for the first ten years of maintenance for the Mellone Park (Library Park) that Harvard built off N. Harvard St. Melloone park is the park with the granite carved lions, of still mysterious origin.
A $5 million endowment would generate a minimum of $200,000 a year for maintenance.