Perhaps take a look at:  https://www.loopnet.com/ and see which types of commercial lease listings interest you and from there take inventory of which brokerage and listing agents are prominently features in the space that interests you.

Speaking to a commercial realtor in the hospitality space would help you figure out the best way to market and sell a property like this.

thanks for the inspiration, I am 21y/o myself and plan on moving into the multi-family space sometime between my mid twenties using traditional financing - but now you have definitely opened up my mind about using creative financing - thanks so much & congrats!

It's also unlikely that you can convert a single-family home into a community center (not sure if you mean an actual community center or co-living space).

Adding livable space or smart home features can significantly boost home value.

I’ve mentioned it to people at work and some friends who are moving to the city, but my place is either too far for them, or they prefer their own space.

In addition to those above-referenced issues related to conversions, the additional unit(s) would require a parking space and enough lot area/gross floor area to meet the requirements in 9-703. 

If you are going to build a shelter, maybe set aside some space for another charity to come in and put in a soup kitchen type of facility to feed your homeless population on the site.Just my 2 cents.

Generally:Minimum size: Most jurisdictions consider a minimum of 70 square feet of floor space.

Furnished Finder is a good idea, even if the fit with travel nurses hasn’t been ideal—it might be worth exploring other platforms for mid-term renters or marketing directly to local families in need of temporary housing.One thought: consider offering seasonal promotions or themed packages to draw in more guests, like holiday stays or discounts for longer weekends.