4. Ulrich is resident and owner of a house and lot situated in Pasay City. Thereafter, Ulrich discovered a deed of real estate mortgage over the house and lot which he supposedly executed to secure a loan from Nigel. The mortgage contract contained a stipulation that “all civil actions arising from or connected with this instrument or any of its provisions shall be brought before the proper courts of Bacolod City, to the exclusion of all other venues of action which are hereby expressly waived.” Aggrieved, Ulrich filed against Nigel an action to declare void the spurious deed of real estate mortgage before the Regional Trial Court in Pasay City. In his answer, Nigel raised an affirmative defense that the venue was improperly laid. The action must be filed exclusively in Bacolod City pursuant to the mandatory venue stipulation. Which between Pasay City and Bacolod City is the proper venue for the action to nullify the deed of real estate mortgage? Explain.