Just make sure to get the rent situation nailed down in the purchase agreement and you'll have no problems.

You nailed it! 

The vacancy could be high for many reasons, such as: 1) High rent/deposit or screening criteria 2) Poorly advertised to potential business owners 3) No popular stores or business types that might attract regular customers e.g. chinese eatery, nail spa, pizza place, pawn shop, liquor store

I think @Ned Carey nailed it

He had already been fed up with being a landlord and I think this drove the nail in the coffin for him.

So far I need to select the market and polish my business plan.

Patrick nailed it, read the file.

We nailed down new plywood subfloors.

While others were having to churn for quick cash, I was able to find those diamonds, polish them and then reap the benefits of their increased value.

These guys nailed it - numbers, location, and that final "gut feel" have lead me right for 3 deals now....