Who should be doing work to rental units?

[Rob Donovan]

I am a general contractor that owns rentals. Both companies are in separate LLC's. Who should be doing the repair work to the rentals? Do I pay myself? Should I run everything through the construction LLC? Should I do the work without paying labor costs to the LLC or me personally, and chalk it up to further personal contributions to the LLC, and if so, how should I account for this? Curious on where the tax man stands.