Boss,

Anyway, it looks like you've got a SP clause there so you can compel them to complete the SPA and get vacant posession.
This is where you must understand the difference:

1) If you go for SP, then the costs which you can recover from the vendor would be the legal costs of litigating the matter in Court. That is all. You can't ask the vendor to pay you for legal fees for SPA and other costs related to the SPA as you are seeking that the vendor honours the SPA and completes it.

Don't be confused with legal fees - if you pay your lawyer xxx amount to file the suit in Court, don't expect the Court to award you the same xxx amount as costs. It will surely be less.

2) If you don't go for SP, then you terminate the agreement and the vendor reimburses you 10% plus another 10% as compensation. That compensation is meant to cover your expenses incurred throughout the SPA. You're not supposed to profit from it - the extra 10% is meant as compensation.

Hope that clears it up for you a bit?