flu, those houses with one acre in Sky Rranch do not have a full useable acre. I’d guess its around 1/3-1/2 acre of useable land and the rest is slope. Those houses alsso have wider foot print than your average tract homes. The side yard are also wider(which means more concrete than sod). The actual back yard space is around the same size as a 2000sq-ft single story on 1/4 acre in Solana Beach.