Alimony in Solido means a lump sum alimony
When the property is sold, there is an element of good faith required on her part. In other words, she can't sell a $500,000 piece of property for $300,000 to her sister and then have her sister sell it back to her for that price to defraud you out of $100,000 (1/2 of the $200,000). If she does that, you will likely have a fraud action against her.
Another option may be to get the court to grant you the first right of refusal on the home. That way, if she does try to under-sell it, then you'll be the beneficiary because you'll have the first shot at the purchase price.
Finally, you will want to divide your retirement with a Qualified Domestic Relations Order (QDRO). That is an order signed by a judge that you send to the plan administrator that carves out her share of the retirement and puts it under her name. The QDRO can be done at anytime because it requires that you include a percentage and an as-of date for dividing (e.g., she gets 1/2 of the balance as of May 10, 2008).
If you found my answer helpful, please click on the GREEN ACCEPT button. Your question will not close, and you will still have the opportunity to follow-up if needed. Leaving a bonus and positive feedback is not required, but doing so is certainly appreciated!