This is an appeal from the granting of a motion for summary judgment.
Appellant, (hereafter Landlord), ABS Sherman Properties, Ltd., brought suit against appellee, (hereafter Tenant), Ibra-him Abu Sarris, M.D., Professional Association, and Dr. Ibrahim Abu Sarris, for lease payments under a lease agreement providing for the lease of office space.
The lease agreement was entered into on February 10, 1977, and called for Landlord to do certain construction improvements to Tenant’s specifications. Paragraph 4 is the portion of the agreement giving rise to this suit. It reads:
“4. CONSTRUCTION OF IMPROVEMENTS: Landlord agrees to construct with reasonable promptness (subject to delays caused by strikes, governmental restrictions, acts of God, unavoidable casualties, labor or material shortages, or causes beyond the control of Landlord) improvements specified on the attached Exhibit ‘C\ Landlord agrees that it shall substantially complete such improvements within twelve (12) months of the date of the execution of this lease agreement; provided, however, that if Landlord is delayed in the construction of the improvements for any of the reasons set forth above, then Landlord shall have such time which it has been delayed in addition to the twelve (12) months. In the event Landlord shall not have substantially completed the construction within the time period set forth above, Tenant may at its option, terminate this agreement by written notice to Landlord. Prior to exercising said option to terminate this lease, Tenant shall give Landlord sixty (60) days advanced notice of its intention to exercise said option. If the improvements are substantially completed prior to the end of said sixty (60) day period or before notice of termination is actually received by Landlord, then this lease shall not be cancelled or terminated but shall be in full force and effect.”
By letter dated December 8,1977, Tenant gave written notice to Landlord of his intention to exercise the option to terminate under Paragraph 4 of the lease agreement. By letter dated February 9, 1978, Tenant gave notice that he had exercised his option to terminate the lease agreement. Thereafter Landlord instituted this suit for damages and attorney fees.
Landlord and Tenant stipulated the facts, including the amount of Landlord’s damages and the amount of a reasonable and necessary attorney fee. Thereafter each filed a motion for summary judgment and the trial court entered a take nothing judgment against Landlord.
It was stipulated that Landlord did not substantially complete the improvements within twelve months of the date of the execution of the lease agreement but that they were substantially complete on April 8, 1978, which date was within one year and sixty days of the execution of the lease agreement.
The entire controversy between the parties in the trial court and this Court is based upon the legal effect of Paragraph 4 of the lease agreement, particularly the legal effect of the last three sentences thereof.
It is the general rule of the law of contracts that where an unambiguous writing has been entered into, the courts will give effect to the intention of the parties as is expressed in every clause of the writing. City of Pinehurst v. Spooner Addition Water Co., 432 S.W.2d 515 (Tex.1968); Young v. DeLaGarza, 368 S.W.2d 667 (Tex.Civ.App.—Dallas 1963, no writ). Here, as in Bales v. Jones, 288 S.W.2d 266 (Tex.Civ. App. —Fort Worth 1956, writ ref’d n. r. e.), neither party sought reformation or rescission of the contract. There was no allegation or proof of any fraud or mistake, nor was there a contention that the language of the lease agreement was ambiguous. Under these circumstances, the terms of the agreement here should be given their ordinary meaning and natural import. To do this, the court must look to the entire instrument with the presumption that every provision was included for a purpose and that the parties intended every word in it to *540have some meaning, effect or purpose. TM Productions, Inc. v. Nichols, 542 S.W.2d 704 (Tex.Civ.App.—Dallas 1976, no writ); Masterson v. Gulf Oil Corporation, 301 S.W.2d 486 (Tex.Civ.App.—Galveston 1957, writ ref’d n. r. e.). The subject matter of the agreement and the situation and objective of the parties at the time the agreement was entered into should be considered as well. Neiman-Marcus Company v. Hexter, 412 S.W.2d 915 (Tex.Civ.App.—Dallas 1967, writ ref’d n. r. e.), quoting Howeth v. Anderson, 25 Tex. 557 (1860).
Landlord bases its contention that the lease agreement was in effect on April 8, 1978, by concentrating upon the third, fourth and fifth sentences of Paragraph 4. Sentence three clearly indicates that Tenant’s option to terminate the lease could not arise until the end of the twelve month substantial completion period. The fourth sentence puts a further restriction on Tenant’s ability to terminate the lease by requiring sixty days “advanced written notice of its intention to exercise said option.” The sixty days advance notice cannot be coterminous with the twelve month period without rendering the fifth and final sentence of Paragraph 4 meaningless. Another rule of construction applicable to contracts is that the court will, if possible, give effect to all parts of an instrument and an interpretation that gives effect to all parts of an instrument and a reasonable meaning to all its provisions will be preferred to one that leaves a part of a writing. useless. Smith v. Davis, 453 S.W.2d 340 (Tex.Civ.App.—Fort Worth 1970, writ ref’d n. r. e.). What may first appear to be a conflict must be reconciled and harmonized, if possible, by reasonable interpretation and the contract as a whole given effect. Fair West Building Corporation v. Trice Floor Coverings, 394 S.W.2d 707 (Tex.Civ.App.—Fort Worth 1965, no writ). To uphold Tenant’s contention would render a portion of Paragraph 4 meaningless and of no effect. It must be presumed that every portion of a contract is there for a purpose and cannot by the courts be disregarded. Jones v. Dumas Development Co., 229 S.W.2d 936 (Tex.Civ.App.—Amarillo 1950, writ ref’d n. r. e.).
The Tenant is correct in its assertion that if the lease agreement is interpreted as contended by Landlord, Landlord would have had fourteen months instead of twelve to complete the construction of the improvements. This assertion is correct and can easily explain why the last sentence of Paragraph 4 is in the lease. The rule of construction applicable here is one which requires courts to give effect to all parts of an instrument, if possible, in preference to holding a portion of the writing to be useless.
Tenant also argues for the application of the rule of construction which requires that a lease be construed most strongly against the lessor. This rule is applied, however, only when the lease provisions are ambiguous. Fisher v. Temco Aircraft Corporation, 324 S.W.2d 571 (Tex.Civ.App.—Texarkana 1959, no writ); Dedear v. Wilson, 220 S.W.2d 534 (Tex.Civ.App.—Austin 1949, writ ref’d); City Hotel Co. v. Aumont Hotel Co., 107 S.W.2d 1094 (Tex.Civ.App.—San Antonio 1937, no writ). Here the language of the lease agreement is plain and therefore is given effect as written.
The judgment of the trial court is reversed, and judgment is here rendered for the Landlord and the court below is instructed to enter judgment for the Landlord in the sum of $10,500.00 as damages, $2,500.00 for its attorney fee, each with interest at the rate of 9% from the 19th day of June, 1980.