I will definitely have to be prepared for the change in climate.

@Christian SolinskiI LOVE it, for a large home, somewhat secluded, in a moderate climate.

Now, down at those temperatures, your COP will be approaching 1.Here where we have cold winters, code requires an ancillary heat source - electric baseboard heaters are most commonly used - to supplement the heat pump in the dead of winter (we frequently get 2-3 weeks where temperatures are below -20C).In a warmer climates, even if code requires you to put in ancillary heat, you should never have to use it.

San Diego has one of the best climates in the US.  

The next one might be a bit larger, but they are thinking its still a few more years out.. unless something major changes in the political or economic climate.

I'm wondering if building modular on a slab might be a way to make the numbers work to build in these neighborhoods.I'm in a cold climate (PA), and building on a slab is not common here (yet).

Many people believe, based on historical events, that states with very high taxes and an unfriendly business climate will not have long-term growth due to out-flow of skilled jobs and people.

In this climate, good contractors are getting top dollar.

Here in upstate NY it is NOT a local custom to expect central AC, and window ACs are typically purchased by the tenant if needed to adjust the interior climate to their liking.Another thing you can do before you run out and buy your AC units, is ask the tenants what they think would be a fair resolution. 

I did know about the state's higher taxes, but having on-the-ground input on the business climate is super-valuable.Hot climates are unfortunately out; my girlfriend doesn't do well in them for health reasons.