What would you recommend I do in this situation?

@Celine Li Recommend 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?

I would appreciate any advice on whether it's a good idea to invest in land on a slope and the potential challenges of building on such terrain.If this seems like a worthwhile investment, can anyone recommend reputable construction companies that specialize in cabin builds on slopes? 

If you don't tackle that type of work, have any recommendations?

There is also about 40% less inventory for Condos than there is for Co-ops.If you're mainly looking to invest in an apartment to save on rent and learn the market, I'd recommend a small multifamily (2-4 unit) investment.

I also read A LOT of books; do you write or have any recommendations? 

You'd need to call the local township which I would recommend doing for any LTBH.

This can lead to consistent limit increases every quarter, which opens up even more opportunities for growth.Having good rapport or a strong relationship with a credible accountant to help simplify and oversee this process is an amazing idea and highly recommended.

Other than that, I'm not sure what to recommend except maybe team up with Lynnbrook for payments outside Airbnb.

I would recommend speaking with @Denver McClure.