Del. Code tit. 25, § 2218

The treasurer shall keep detailed records of all receipts and expenditures, including expenditures affecting the common elements specifying and itemizing the maintenance, repair and replacement expenses of the common elements and any other expenses incurred. Such records shall be available for examination by the unit owners during regular business hours. In accordance with the actions of the council assessing common expenses against the units and unit owners, the treasurer shall keep an accurate record of such assessments and of the payment thereof by each unit owner.