it is a huge leanne mendez this new reward. >> reporter: no one has come forward.evelopers hope that by offering $300,000, someone will help catch the person or people responsible for destroying multi family units under construction. >> the individuals will receive $300,000 after the conviction sometimes within a couple of months after the conviction. >> on july 7 eastwath last year project went up in flames on valdez street. investigators never rule d out arson. today they built what was lost but they added security measure. every border of this multi family housing construction product has been burned down twice. >> it seems to be certain patterns of the fires that caused us to be the work of a group of individuals working together. >> many of these projects of income house ing and some are l income. >> burning there of what we are trying to build up is not going to help that. these huge fires have not deterred developers from investing in oakland. >> we have 6,656 units of housing under construction. >> the mayor says they are building a record number of housing