Why are a number of big boy multifamily real estate investors buying smaller under 100 unit assets in addition to 100+ unit assets?

There are a number of big boy multifamily real estate investors that are buying smaller under 100 unit assets in addition to 100+ unit assets. Those real estate investors that have the efficiency to acquire under 100 unit deals are finding deals with high rents, low operating expense ratios (due to no amenities and on-site labor costs), and better purchase prices per unit than larger deals. In addition, due to the small number of 100+ unit deals coming to market, buying under 100 unit deals nearly doubles the number of chances they have to place equity.