There are two options I have offered and I want to get a check on here if I am off base with my offer or if I need to push harder.

I see 3-5 as a fad.Fractional ownership - way to much overhead for these to be profitable. think "timeshare".STR in non traditional markets - running a STR is a business and real estate, boils down to location location location - who would want to go to a conference and stay in a STR vs. the hotel where the conference is at, most businesses pay for this I do not see why.Mixed use with green - this has been going on for years- it will continue but it is also more expensive to build - which means higher costs to use.Not trying to be debbie downer, I have seen these attempted to be done in the past and they really have not been successful.I do really like the BTR model though as I continue to see that as a very good option in the future. 

While these vendors are typically reputable and skilled, you might not get the best price compared to shopping around directly.

You won't be able to use conventional financing and must use a non-recourse loan which typically require 40% down.

There are some home loan options that require as little as 3.5% or even 0% down.

So typically 5 units or above.

Expect rates to be higher than "typical" financing programs - right now, I'd plan for at least 8%+ depending on the whole scenario. 

We are wondering what would be the best option to do with the property during this 6-7 month period, whether that be Airbnb or what other short term rental options might there be that could make more sense?

@Thomas FarrellRecommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

In southern CA, even garage conversion ADU additions are typically costing more than the value added.