Do you live in the same city as you plan to develop ?
If you live in So Cal and are doing ti remotely, forget it.
The only thing remotely close to this that we’ve done is to do a full-scale renovation (and doubling the size) of a single-family home within 5 minutes of where we were living at the time.
Even though I hired a general contractor, at some point I was making ~daily visits to the site. In some cases I found things that were wrong (e.g. – framing of windows in the wrong place). IN other cases I went to see the impact of some things we uncovered along the way (e.g. the need to re-do the one bathroom we intended to keep due to dry rot and water damage) or simply review adjustments that the contractor had to make.