Help!

[DEONE WILLIAMS]

A four bdrm, 1.5 bath single family , HAS A C of O in EFFECT until March 1, 2018, Use to be rented for $900 a month. . The property is being sold "AS IS" The price reflects the rehab needed. The Buyer's agent to verify ALL INFORMATION.
the property manager said he can renovate the house for 6k.

this is the statement under the property and read this, please someone tell me what does

HAS A C of O in EFFECT until March 1, 2018; mean this is the first time that I have seen this statement. And no I do not have it under contract. Thank you in advance. This property is a marketed as a FSBO.