Value of Quadraplex?

[John C.]

For the experienced multifamily investor:

Assuming all systems are good and there is little to no deferred maintenance what sort of value do you think a stabilized, brick skinned quadraplex with slanted roof would be worth in a solid "C+" area with shopping (WalMart, Kroger, etc) and public transportation within walking distance and major employment centers nearby?

These are the numbers:

Gross Cash Flows : $26,400

Net Operating Income $20,507 (after taxes, insurance, water, trash, and grounds). Fully occupied with a waiting list.

What questions/concerns come to mind?