
583 P.2d 1080 (1978)
HOST INTERNATIONAL, INC., a Delaware Corporation, Appellant,
v.
SUMMA CORPORATION, a Delaware Corporation, d/b/a Desert Inn Hotel, Respondent.
No. 9962.
Supreme Court of Nevada.
August 25, 1978.
*1081 Wiener, Goldwater & Waldman, Ltd., and Gerald M. Gordon, Las Vegas, for appellant.
Lionel, Sawyer & Collins, and Steve L. Morris, Las Vegas, for respondent.

OPINION
PER CURIAM:
This appeal is from a judgment which denied injunctive and declaratory relief to compel respondent to renew a lease of gift shop space at the Desert Inn Hotel in Las Vegas. The initial lease for a term of 5 years, commencing June 1, 1972, and ending May 31, 1977, required the renewal option to be exercised in writing 90 days prior to expiration of the original term, i.e., no later than March 2, 1977. Written notice was not tendered until April 13, 1977.
The general rule, acknowledged by both parties, is that "[t]he right to renew is lost if notice is not given as required by the lease." Benetti v. Kishner, 93 Nev. 1, 2, 558 P.2d 537, 538 (1977). Nevertheless, appellant contends (1) respondent waived or may be estopped to assert the requirement of written notice; and, (2) special circumstances exist which warrant equitable intervention. Neither contention has merit.
1. "A waiver is the intentional relinquishment of a known right. [Citation omitted.] If intention is to be implied from conduct, the conduct should speak the intention clearly." Reno Realty v. Hornstein, 72 Nev. 219, 225, 301 P.2d 1051, 1054 (1956). This record is devoid of any evidence that respondent intended to waive its right to written notice. See Medomak Canning Co. *1082 v. York, 143 Me. 190, 57 A.2d 745 (1948). Furthermore, the facts of this case do not indicate, nor does appellant suggest, that any discussions of the parties lulled appellant into inaction. Consequently, no estoppel arises. Cf. Summa Corp. v. Richardson, 93 Nev. 228, 564 P.2d 181 (1977).
2. Although special circumstances may warrant equitable relief from failure to comply with a written notice requirement, no such circumstances are present here. See, e.g., American Houses v. Schneider, 211 F.2d 881 (3d Cir.1954); Benetti v. Kishner, supra; Dugan v. Haige, 54 So.2d 201 (Fla. 1951); Flint v. Mincoff, 137 Mont. 549, 353 P.2d 340 (1960); Jones v. Gianferante, 305 N.Y 135, 111 N.E.2d 419 (1953); Gruber v. Castleberry, 23 Ariz. App. 322, 533 P.2d 82 (1975); Pouquette v. Double L-W Ranch, Inc., 11 Ariz. App. 279, 464 P.2d 350 (1970). On the contrary, appellant admitted that timely exercise of written notice was simply "overlooked." Equity will not intervene to protect a lessee from its own negligent failure to give the required written notice. Medomak Canning Co. v. York, supra; I.X.L. Furniture & Carpet Installment House v. Berets, 32 Utah 454, 91 P. 279 (1907).
Affirmed.
