You should call your plan administrator to get the correct answer. There should be a telephone number for customer service in your quarterly statement.
If you plan to borrow from your retirement plan for down payment and finance the rest, the mortgage underwriter will require a copy of the terms of the loan, repayment schedule, and if the payments will be deducted from yuor paycheck. Just a heads-up if that is your intent... it's easier to plan to have those documents when you take out the loan rather than trying to chase them down later when underwriting makes the request. Your plan administrator should know what is required... it's a common request