Okla. Stat. tit. 11, § 11-39-109: Award of contract - Payment of contractor

After the governing body creates a district, the governing body

may proceed, either to make the improvement by force accounting, or

call for sealed bids on the proposed improvement, or where the

district comprises land owned by a single party, developer, or other

legal entity that has petitioned for the creation of the district,

contract with that single party, developer or other legal entity to

make the improvement for future dedication or other conveyance to

the city; provided, however, in the case of the districts created

pursuant to Section 39-103.1 of this title and except as otherwise

provided in this section, the governing body may contract for said

services without calling for sealed bids or force accounting. The

notice shall state the manner of payment to the contractor and

whether the contractor will be paid in money, in bonds or in a

proportion of money and bonds for making the improvement. The

governing body may to the extent that funds are available authorize

payments to the contractor during the construction of the

improvement provided that the payments do not exceed the amount of

work completed and that ten percent (10%) of such payments shall be

retained by the city pending final acceptance by the city of the

improvement. The term "improvement" as used in this section and

Sections 101 through 136 of Title 61 of the Oklahoma Statutes shall

not include any services or maintenance authorized and provided

pursuant to Section 39-103.1 of this title.