They have been the lump of coal in the Trump rally's equity gift bag: real estate investment trusts.

Investors, however, may be missing out on a good buy, especially in one fast-growing REIT sector: warehouses. These nondescript buildings may be the least sexy sector in real estate, but demand for them is outstripping supply, and rents are rising fast, all thanks to the stunning growth of e-commerce. Still, investors have been leery lately of even this REIT sector, as they shy away from commercial real estate stocks in general.