Spirit Realty Capital Inc. ($19.66 0.25%) rose the most since its initial public offering after agreeing to merge with Cole Credit Property Trust II Inc. in a deal that would increase its properties, which are leased to individual tenants.

Investor demand is growing for so-called triple-net-lease companies, in which the tenant is responsible for paying all of a property’s costs including maintenance, taxes and insurance, minimizing expenses for the owner.