No plan of attack survives contact with the enemy -- Military sayingThis is not your bog standard apartment complex. It is a business with many moving parts. It will be profitable if all those details get worked out, including making money from concierge services, parking fees (from both residents and non-residents) and vending machine meals.
The information on this site has been researched thoroughly over many years. I think it is a sound concept.
That doesn't mean it's exactly "plug and play" ready. Nor will it ever be.
Passive solar design is site specific. If you build something that works wonderfully in Western Washington, you CANNOT take the blueprints from that building and replicate THAT BUILDING in the High Desert of Southern California and expect it to work equally well. These are very different climates.
Concierge services will be specific to the location in question. Exactly what you offer may differ from one building to the next IN THE SAME CITY because different eateries will deliver to one address but not the other.
I can foresee there being some issues with pied a terres. My assumption is people renting a unit as a vacation home will most likely want the larger units with full private baths.
I could be wrong about that and it could vary from one location to another. You may find it makes sense to upgrade SOME of the larger units that get rented as pied a terres and charge more rent for them.
You may end up having friction over parking from the people renting vacation units. People wanting to rent a place as a vacation home may want to economize by NOT reserving a parking space all month for their car and EXPECTING to be readily able to rent one on a daily basis on weekends when they show up.
You may find those are your busiest weekends for the garage and they can't get a space. You may have to work out requiring them to reserve a space or insist they rent at least one parking space full-time to make it work logistically.
A lot of these issues will be site specific. You may see problems of one type at a project in a vacation destination and problems of a different sort at projects near colleges that lack dorms.
You may need to heavily educate the board of review or whomever you are working with to get your plans approved because this is out of the box thinking. IF it works to solve the problems I would like to see solved, it will do so BECAUSE it's not a standard apartment complex but this means people may not immediately understand why this works or how this works or what is different about it.