16. Costs of preparing tenders  17. Ownership of tenders  18. Joint venture or consortium  August 2020 c4b_itt_en.doc  Page 11 of 17  19.4 After the public opening of the tenders, no information relating to the examination,  clarification, evaluation and comparison of tenders, or recommendations concerning the  award of the contract can be disclosed until after the contract has been awarded.  19.3 At the tender opening, the tenderers’ names, the tender prices, any discount offered, written  notifications of alteration and withdrawal, the presence of the requisite tender guarantee (if  required) and such other information as the contracting authority may consider appropriate  may be announced.  19.2 The tenders will be opened in public session on  04/01/2021 at 2:00 p.m. (local time) at  Mustafa Kemal Mahallesi, Dumlupınar Bulvarı, (Eskişehir Yolu 7. Km), 2151.Cadde,  No:154/A, Kat:7 06530 Çankaya/Ankara/Turkey  by the appointed committee. The  committee will draw up minutes of the meeting, which will be available on request.  19.1 The purpose of the opening session is to check whether the tenders are complete, whether the  requisite tender guarantees have been provided, whether the required documents have been  properly included and whether the tenders are generally in order.  18.2 The tender may be signed by the representative of the joint venture or consortium only if it  has been expressly so authorised in writing by the members of the joint venture or  consortium, and the authorising contract, notarial act or deed must be submitted to the  contracting authority in accordance with point 11 of these instructions to tenderers. All  signatures to the authorising instrument must be certified in accordance with the national  laws and regulations of each party comprising the joint venture or consortium together with  the powers of attorney establishing, in writing, that the signatories to the tender are  empowered to enter into commitments on behalf of the members of the joint venture or  consortium. Each member of such joint venture or consortium must provide the proof  required under Article 3.5 as if it, itself, were the tenderer.  18.1 If a tenderer is a joint venture or consortium of two or more persons, the tender must be a  single one with the object of securing a single contract, each person must sign the tender and  will be jointly and severally liable for the tender and any contract. Those persons must  designate one of their members to act as leader with authority to bind the joint venture or  consortium. The composition of the joint venture or consortium must not be altered without  the prior written consent of the contracting authority.  No costs incurred by the tenderer in preparing and submitting the tender are reimbursable.  All such costs will be borne by the tenderer.  The contracting authority retains ownership of all tenders received under this tender  procedure. Consequently, tenderers have no right to have their tenders returned to them.  In the case that at the date of the opening session some tenders have not been delivered to the  contracting authority but their representatives can show evidence that it has been sent on  time, the contracting authority will allow them to participate in the first opening session and  inform all representatives of the tenderers that a second opening session will be organised.  19. Opening of tenders 