The Denver International Airport moved to end its contract with Great Hall Partners to renovate the main terminal amid a series of delays and disputes, according to sources and a document obtained by Denver7. Denver7 obtained documents from a public filing system Tuesday morning showing that Michael Sheehan, the senior vice president for special projects at DIA, sent a letter to the Great Hall Partners CEO, Ignacio Castejon Hernandez, notifying him that DIA intends to terminate the agreement.The move to end the contract came a day after Great Hall Partners and DIA officials said they hoped to continue to work together despite the airport rejecting a claim to give the contractor more time and money to complete the project, which was originally supposed to be finished by November 2021. The contract was originally for USD 1.8 billion, with USD 650 million budgeted for the renovation and the rest budgeted for upkeep over the next 30 years. But Great Hall Partners had said in recent months that they expected the renovation to cost millions more.The letter obtained Tuesday and sent late Monday night says the contract would be terminated "for convenience" and that DIA "has determined that such termination is in the best interest of the Owner." It also said the termination "shall be effective on November 12, 2019."