Per the original use agreement, the City of St. Petersburg appears to be on the hook for the repairs needed to make Tropicana Field playable (even though it’s Pinellas County that draws tax revenue from the Rays playing in St. Petersburg).
In its initial assessment of the damage to Tropicana Field, the city report proposes a total repair cost comes just over $55 million (including the ~$6 million initial repairs to protect the site from further damage).
That amount could go up if additional damage is discovered or occurs before the exposed inside is fully waterproofed, and when the estimate for the cost of replacing an acoustical membrane beneath the dome — which the city has requested — is completed.