Vowing to build a Masjid and building it, then destroying it to build a bigger one

A: It is obligatory on the Muslim to fulfill his vow so long as it is an act of obedience to Allah. It was authentically reported that the Prophet (peace be upon him) said, Whoever vows to obey Allah should obey Him. Related by Al-Bukhari. Actually, your vow is already fulfilled. Yet, as the conditions later changed and a larger Masjid was raised in the region, provided that the piece of land you vowed proved harmful and was used as a path for Muslims, there would be no blame on you in this respect - In sha’a-Allah (if Allah wills).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.