Abandonment of long-term lease contract

Good Day Sir/Mam,

Nakapirma po ako as Lessor with a foreigner for a 25 years lease term on our farm which started Nov2004.
Last due collection was on Oct2012 (notice letter served) at gusto nila hindi na magbayad. Reason: hindi natuloy projects nila sa farm and instead built their new plans in Subic (2buildings). On every collection for the past 8 years verbal assurance was given to us that their initial project will push through.
Wala pong nakalagay sa contract na option na pwede silang magback-out anytime they wish. Wala din po sa contract na pwede ako magdemand ng payment in case of a breach. It only states the extension of their lease upon completion of the 25 years. and that the lessor gives notice 1 year in advance in case of termination...not the lessee.
Ano po ang best remedy ko para hindi naman sudden/biglaan yung abolishment of contract? Can i still demand payment for 2013?
Your advice is greatly appreciated.
Thank you so much.

yes you can still demand payment. the right to seek damages for breach does not have to be written in a contract.