Also, more out of curiosity than anything else, how did the neighborhood react to the build?

But you can set up re-accruing payments (mortgages, life insurance, etc.).

Asking to satisfy my curiosity only.

One question out of curiosity is why did she remove the upgrades-did she plan on using them elsewhere? 

At least with a LOC, you can determine how much to take out and the money sits ready not accruing any interest until you use it.

one thing not mentioned yet- if you comingle business and personal on one card and accrue interest, you can't deduct the interest as a business expense.  

Not collecting them within a "reasonable" time of when they're due has been court interpreted as constructively altering the lease to eliminate late fees entirely.So at least in Ca, you'd best collect the late fees as they accrue and not wait until later.

@Amy Kendall what would your drop dead score be, just out of curiosity.

As you accrue more money in the near future you can look at more creative ways to employ it into investments. 

Why not start small and use the accrued equity to purchase more in the future?