What is a good return on equity (RoE) for a rental?

[Larry Flanagan]

A rental house I've had for a couple years just came vacant.  I am on the fence whether to re-rent or cash out.  Here are the #s:

$910 gross rent

50% vacancy & expenses

= $455 net ($5460/yr)

- $2100/yr interest expense

= $3360/yr net after debt.  My actual cash flow is much less because I have it on a short amortization and am paying down the mortgage fast.

I could sell today and net after capital gains taxes about $36000.  This means my current RoE is about 9.4%.  I cant say I have anything much better to do with the money today if I sell, but this seems like a pretty low return on my equity.  It will take me ten years to make the money renting that I can make today by selling.  How does this RoE compare to others?