If you find a sublet-friendly co-op and it requires an "All-Cash buyer", there could be a good reason.The points you mentioned regarding co-ops are valid but do not apply to all co-op boards across this market.

At closing, the accumulated credit is applied to reduce the purchase price, eliminating the liability.

If your rental property is occupied, there are different rules that apply for selling to an investor versus selling to a buyer who intends to occupy the property.

Depreciation recapture may also apply, taxed at up to 25%.

Nope that does not apply to business purpose financing. 

@Joy McQuearyRecommend 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?

The loan programs of your buyers will dictate how much of a credit you are allowed to apply to their closing but it certainly helps to move inventory when you offer an incentive. 

Transitioning to Business Credit CardsOnce your business credit profile is established, apply for business credit cards.

Then these are applied to all properties in that area of the city.

@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?