>> i'm mark zucker. i'm the adjacent neighbor at 444 greenwich. i'm also a design professional and design custom homes all over. i have a lot of expertise in this matter. a little history on this property and my property. i purchased my home roughly 3 1/2 years ago. it was in dire need, everything needed to be replaced. the first thing that we did was to reach out to the neighbors and the telegraph hill dwellers and understand the neighborhood and the intent of the neighborhood and how -- how things work. and what people's expectations were. based on that, i worked backwards. as the -- as a result, i maintained the integrity of the home. 1908. we kept the entire building envelope intact. we didn't go up or out. we worked within our envelope to preserve the height to our neighbors, including the neighbor next to us who is proposing push out. 18 months ago we completed the renovation. the photos i prepared illustrate that. my problem here is a proposal -- i looked at item 10, there was an impact. this is a significant impact, much more than that. we

>> yes. >> reporter: i asked about some issues in the social network that marked zucker that mark zuckerberge? >> reporter: one of the points of contention in the movie is that he started facebook because a girl rejected him or because i wanted to get girls. >> they completely left out the fact that my girlfriend i've been dating since before i started facebook. >> reporter: the girl... your current girlfriend, you were dating back then? >> yeah. i've been dating my current girlfriend since before i created facebook. >> reporter: did you know about priscilla chan when you wrote the movie? >> no. >> reporter: up didn't know that they were dating back then. >> no, her name didn't come up. >> reporter: if you had known that he had a girlfriend, would you have put that in, do you think? >> no. listen, there's a lot about mark's story like he's an accomplished fencer. >> reporter: did you know that? >> yes. >> reporter: you chose to.... >> this isn't a biopic. it's not a profile of mark zuckerberg. it's the story about a lawsuit. priscilla was not a witness. her name does not come up in depositio