If an investor has the time, knowledge, capital and experience to be an active property investor then there are a number of strategies , that, depending on the economic market can be used to accelerate wealth building.  

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

I’m going to disagree with @Chris Seveney and say whether an assignee could force a sale directly would be a state law issue and heavily dependent upon the contract terms. 

@Helena Goyvaerts rate for a 30-year fix would be at least 8.5% with some points (1% of loan amount).Most DSR lenders have a minimum credit score requirement from the applicant.

This will cost you $3-$4K, depending on your state, and will allow you access to the MLS.

Take stock of your current credit score and accounts.

Im self employed, roughly make $130k gross anually, 1099 NEC , no debt at all, 740 credit score. 

The best amenities for Airbnb in terms of ROI often depend on your target audience and the location of your property.

As for Cash flow, I think it depends on the deal structure as you mentioned, but also strategy/approach (cash flow vs building asset, holding long term).

Wholesaling commercial property is possible, but it depends on each scenario.