Are parking spaces a good plan investment?

[bzorc]

A defined benefit plan that I work on is considering an investment in parking spaces (this is in Chicago, where parking is at a premium, don't ya know...). They will charge rent and the rental income will go to the plan. There is no relationship between the plan and the parking spaces, so from this aspect it doesn't fall into Prohibited Transaction territory.

Would you allow the plan to have this investment? I am wavering....

Thanks.