Large  multifamily 30+ tends to have lower ROI than the 12-20 units from what I've seen.Things To Consider (Multi Family)Income: Gross Income, Laundry, Storage, Garage, Signs, Solar Panels, Cell Phone Antenna, Expenses: Common area utilities, Heat, Sewer, Water, Insurance, Landscaping/Snow Removal, Pest Control, Professional Fees (Accountant, Eviction Attorney), Repairs, Maintanance, CapEx (Reserves for Boiler, Roof, Etc.)

During demo we found a tremendous amount of additional damage and a very active infestation.

One roof, one pest control contract, one parking lot to maintain, one gardener, etc.And I personally really dislike duplexes as a renter.