根据条文，房东转卖房产无需现有租客同意，并有相关规定，看内容，新房东似需遵守现有合同的各项条款。
有关房屋转卖的条文如下（附上俺的中文理解）：
§119. Conveyance of property—Attornment of tenant （房产的转让及租户的认可权）
A. A conveyance of real estate, or of any interest therein, by a landlord shall be valid without the attornment of the tenant, but the payment of rent by the tenant to the grantor at any time before written notice of the conveyance is given to the tenant shall be good against the grantee.（房东做出的房地产或其它相关财产的转让无需征得租户的同意。但是，租户在接到房产转卖通知之前已付给原房主的租金，新房主不可重复索要。）
B. The attornment of a tenant to a stranger shall be void, and shall not affect the possession of the landlord unless it is made with the consent of the landlord, or pursuant to a judgment at law, or the order or decree of a court.（除非有新房东的同意，或依据法庭判决或有关法律条文生效之外，租户自行转让租权给他人无效，新房东有权收回出租房产。）
C. Unless otherwise agreed and except as otherwise provided in this act, upon termination of the owner’s interest in the dwelling unit including, but not limited to, termination of interest by sale, assignment, death, bankruptcy, appointment of a receiver or otherwise, the owner is relieved of all liability under the rental agreement and of all obligations under this act as to events occurring
subsequent to written notice to the resident of the termination of the owner’s interest. The successor in interest to the owner shall be liable for all obligations under the rental agreement or under this act. Upon receipt by a resident of written notice of the termination of the owner’s interest in the dwelling unit, a resident shall pay all future rental payments, when due, to the successor in interest to the owner.(除非各方同意和本法另有规定外，一旦因出售房产，转让，本人死亡， 破产和他人继承等变更因素造成原房东对其房屋所有权不再拥有时，其对现租房合同里所需执行的义务和责任在书面通知租户这一决定后则一笔勾销。新的房东需执行现有合同或本法所规定的各项责任。租户在收到原房东书面有关通知后，其所有租金应按时付给新的房东。)
--------------------------------------------------------------------------------------------------以上若有理解不当的地方请其他大侠指正，补充。
点击上面Oklahoma Landlord-Tenant Acts封面图片看整部法律条文
