Trump bought the former estate of Marjorie Merriweather Post in 1985 and turned it into a members-only club in 1993. To transform the private residence into a revenue-generating business, he had to agree to certain limitations based on guidelines presented as deal-breakers from Palm Beach.
For example, there could be no more than 500 members, there were rules concerning parking and traffic, and club members could not spend more than seven consecutive days at Mar-a-Lago, or no more than three weeks total a year.
In typical Trump fashion, he applied for and got variances to turn the property into a club and lower the taxes however, the restrictions on the number of members, etc, cany make it barely profitable. Then he complains the value is low and inflates it a billion times.
I have no idea what it is worth - the land alone is valuable however, if PBC restricts it as historic from being divided or more built on it then that would impact the value -