We bought in Feb 1.5 blocks from sunset cliffs blvd for $2.78/sqft.

I think you meant $278 per square foot. Since this area is driven more by lot price than structure, this number is not useful.

For example a 1000 original-built house in that area (I think there is one left) might go for 850K (about $850 per square foot). While a remodeled 4800 sf home might go for 2 Mil ($417 per square foot). In actuality, the first house is essentially lot value and the second house is lot value plus
about $240 per square foot.

How large was the house ? Exact number not needed, just a range.