that party has been served personally, on the date of service: or mailed by pre-paid registered mail, on the date received or on the Sixth day after receipt of mailing by any Canada post office, whichever is the earlier, so long as the notice is mailed to the party at the most recent address shown on title in the records of the Land Title Office for that party or to whatever address the partias from time to time may in writing agree to; whenever the singular or masculine is used in this Agreement, the same is deemed to include the plural or the feminine or the body politic or corporate as the context so requires; every reference ta each party is deemed to include the heirs, executors, administrators, successors, assigns, employees, agents, oftticers and invitees of such party whenever the context sO requires or allows; any opinion which the City is entitled by virtue by this Agreement to form may be formed on behalf of the City by the City Engineer in which event the opinion of the City Engineer shall be deemed to be the opinion of the City for the purposes of this Agreement; if any section, subsection, sentence, clause or phrase in this Agreement is for any reason held toa be invalid by the decision of a Court of competent jurisdiction, the invalid portion shal! be served and the decision that it is invalid shall not affect the validity of the remainder of this Agreement; this Agreement shail enure to the benetit+ of and be binding on the parties hereto NOTWITHSTANDING any rule of law or equity to the contrary; and this Agreement shall be governed and construed jn accordance with the laws of the Province of British Columbia,