When a Real Estate broker is the buyer Question

[Gail Eller]

Hi, I would like to ask if a real estate broker is obligated to give a value to the seller when the broker is the buyer and the seller did not ask the value.  In other words,  if a seller calls a broker and says he will take a certain dollar amount for his property but the broker feels it is worth much more, so the broker wants to buy it himself,  Is the broker required to disclose value to the seller prior to buying it for himself? The broker and seller do not have a signed listing agreement. Florida. 

Thanks

Gail