Question about lot size

[Kal Saeed]

There’s a small house on my street on 80x100 lot. 8000 sqft on a corner street. No neighboring home on the left side. Only neighbor’s house is on the right and another one back of the house. How big of a house can I build on this lot if I demo the current home and build a new foundation? New construction has been built in the same street with 2900sqft homes on 100x100 lot 10,000 sqft. Thank you