It would be only be up to the date of separation. Here’s what the law says about splitting pensions and retirements:
" (d) The award shall be determined using the proportion of time the marriage existed (up to the date of separation of the parties), simultaneously with the employment which earned the vested and nonvested pension, retirement, or deferred compensation benefit, to the total amount of time of employment. The award shall be based on the vested and nonvested accrued benefit, as provided by the plan or fund, calculated as of the date of separation, and shall not include contributions, years of service, or compensation which may accrue after the date of separation. The award shall include gains and losses on the prorated portion of the benefit vested at the date of separation."
I would say that it depends on if his retirement benefits are worth more that the house…Her lawyer is trying to get the house for her and in return they are negotiating. If he takes this deal and pays her 1/2 his retirement it would only be up to the date of separation and she would owe him 1/2 the home equity. He needs to make sure that it is all in writing that he can understand, and he really should pay to have an attorney look over and explain any paper work just to protect himself.