How about repairs ?  

Additionally house tenants bring more of their own appliance, like refrigerator, washer and dryer; which means tenants are responsible for repair and replacement of their own appliances. 

You can also write off expenses such as property management, insurance, repairs, etc.

Mine rented in less than 15 days.)All in all, that gives me $140 a month for vacancy, CapEx, and repairs.

I’ll also amortize large items like roof over 20 yrs, and then add $100/mo/unit for general repairs.

They should have also gotten approval from you before charging and doing repairs.

Looking over your numbers I'm surprised a couple of them are so low - mortgage expenses, repairs and capital expenses.

This can be especially helpful if you’re uncertain about repair assumptions or costs.If it’s a contractor you’ve worked with multiple times, involving them early in the process is often beneficial.

I'd be able to put 20% down on each and have money left over for some repairs/updates.It seems like I'd initially take on more stress, less initial return but the long term scalability seems great.  

I doubt it would qualify for a conventional loan with the repairs that need to be completed.