In the other thread, about 10 of us modeled the entire life cycle of the HELOC vs conventional mortgage and mortgage was better in every case.

I think it more of a personal preference on material and figuring out what you want to spend i.e. cheaper up front cost vs cheaper lifecycle cost. 

This is a a learned skill, usually by being burned by a deal or city, and taking a loss either early or late in a projects lifecycle. 

Any fund that you have/create is going to have a definite life cycle (youcan extend it, if that provision is allowed in your offering documents) and how are you going to deal with investors getting their capital back?

@Crystal Perezis right on the life cycle and hardiness of the bug.  

But it's because I had this fund that I was able to still beat those indexes.If I take no action, they will move the money into a "Lifecycle" fund.

The installs are usually met with great press & fan-fare, but the lifecycle costs of these systems usually FAR exceeds the initial estimates.Solar is a huge headache. 1.

If something seems extremely old, or is nearing the end of its anticipated life cycle, proactively get quotes.

Do you really have the skills, desire, time, etc to build the systems, network of contractors, to self manage all the phases of life cycle of a property to gain that extra % on the investments.   

But holding rental property is a very old and relatively unexciting endeavor, and there are reams of data available to inform on how much of the "Gross Potential Rent" actually hits your bottom line through the life cycle of the property. 50% if using PM and 35-40% if not using PM are pretty sound estimates for SFRs.