Appellant James R. Hoyt (“Hoyt”) appeals from a district court order granting summary judgment in favor of appellee Roche Brothers Supermarkets (“Roche Brothers”). In this personal injury case, Hoyt alleged that he sustained injuries to his leg due to Roche Brothers’ negligence. The district court held that no reasonable jury could conclude that it was more likely than not that Roche Brothers had caused the dangerous condition that led to Hoyt’s injury. We reverse, finding that the district court relied on impermissible inferences in favor of the moving party in reaching its holding.

The injury in question occurred as follows. On the morning of December 15, 1997, Hoyt, a resident of Concord, New Hampshire and a truck driver for Lilly Transportation, stopped at the loading dock at a Roche Brothers market in Acton, Massachusetts, to deliver eggs. A coworker accompanied Hoyt. The loading dock could accommodate two trucks and, after waiting briefly for one truck to leave, Hoyt pulled in next to another truck. At that time, a number of empty pallets— portable wooden platforms on which truck drivers often deliver their loads — were *27 stacked on the loading dock. While Hoyt was unloading eggs from his truck onto a cart on the loading dock, several pallets fell on him, injuring his leg. The pallets in question had been leaning up vertically against a stack of horizontally stacked pallets, which the parties agree created a dangerous situation. Hoyt brought this case in district court based on diversity jurisdiction.

Under Massachusetts law, a property owner has a duty to lawful visitors to maintain his property in a reasonably safe state. Mounsey v. Ellard, 363 Mass. 693, 707, 297 N.E.2d 43 (1973). A property owner is liable if he has notice that an unsafe condition existed. Notice is satisfied if 1) the property owner or its employee caused the unsafe condition; 2) the property owner or its employee had actual knowledge of the condition; or 3) the unsafe condition was present and evident for a time long enough that the property owner or its employee should have known about it. Oliveri v. Mass. Bay Tmnsp. Auth., 363 Mass. 165, 167, 292 N.E.2d 863 (1973). The only question on appeal is whether the district court properly granted summary judgment in favor of Roche Brothers on the issue of whether Roche Brothers or its employee caused the unsafe condition — that is, the vertical stacking of the pallets — that led to the pallets falling on Hoyt’s leg. 1

Summary judgment is proper where the evidence shows that “there is no genuine issue as to any material fact and that the moving party is entitled to a judgment as a matter of law.” Fed.R.Civ.P. 56(c). A court may enter summary judgment “against a party who fails to make a showing sufficient to establish the existence of an element essential to that party’s case, and on which that party will bear the burden of proof at trial.” Celotex Corp. v. Catrett, 477 U.S. 317, 322, 106 S.Ct. 2548, 91 L.Ed.2d 265 (1986). The question of whether a Roche Brothers employee caused the unsafe condition is such an element. Hence, in order to escape summary judgment, Hoyt must present evidence sufficient for a reasonable factfinder to find that a Roche Brothers employee caused the pallets to be stacked vertically. When evaluating such evidence, the court must draw all reasonable inferences in favor of the nonmovant, Cippollone v. Yale Indus. Prod., Inc., 202 F.3d 376, 378 (1st Cir. 2000), in this case, Hoyt.

We review the grant of summary judgment de novo. Id. No direct evidence was offered in this case about who placed the pallets that injured Hoyt. The parties instead put forth circumstantial evidence showing how the pallets were generally handled. The relevant evidence was provided by several Roche Brothers employees. George Hayes, the Roche Brothers receiving clerk at the time of the accident, testified that truck drivers typically brought pallets into the receiving area of the store to unload the merchandise and that they then took the empty pallets away. He stated that some truck drivers preferred to leave the loaded pallets at the store to be unloaded by a sales representative or a Roche Brothers employee and that in that case the empty pallets were retrieved at a later time. ' According to Hayes, pending pickup by the truck drivers, empty pallets were stored on the loading dock. Because the pallets were gener *28 ic and unmarked as to ownership, truck drivers retrieving pallets could take any empty pallets awaiting removal.

Hayes also testified that he was responsible for keeping the receiving area clean and organized, including the stacking of empty pallets. He explained that when he first came into work early in the morning he collected any empty pallets in the store proper and stacked them. Then, at six o’clock a.m., when he opened the door, he moved the stacked pallets to the loading dock. During the course of the day, he continued to stack empty pallets on the loading dock. James Lundy, the store manager at the time of the accident, confirmed that empty pallets were stacked on the loading dock, among other places, for driver pickup. However, both Hayes and Lundy, as well as David Kerr, the director of human resources for Roche Brothers, testified that in any event it was the practice and the policy of Roche Brothers and its employees to stack the pallets horizontally and not vertically and to re-stack any pallet found lying on its side. 2

The record thus indicates that Roche Brothers employees, and specifically Hayes, were responsible for stacking empfy pallets at the Acton store. There is no evidence in the record that anyone other than Roche Brothers employees stacked empty pallets on the loading dock. The evidence admittedly demonstrates that truck drivers handled pallets in the sense that they brought them, loaded with merchandise, into the store and that they picked up empty pallets from the stacks on the loading dock and took them away in their trucks for future use. But the record contains no evidence to support the position that truck drivers stacked empty pallets or dealt with empty pallets in any way other than to pick them up and take them away.

The district court, however, came to the opposite conclusion — that is, that “sometimes pallets ended up leaning vertically because of the drivers handling of them” (Memorandum and Order, No. 99-12172-DPW, at 3 (D.Mass., May 2, 2001) (hereinafter “Order”)). Specifically, the district court pointed out that Hayes had testified that he occasionally would see pallets left vertically, but that “when you receive in a store for a period of time you have certain rules and they know that’s a no, no with me.” 3 The court concluded that in that *29 context “they” referred to truck drivers (Order at 7, n. 1). The court also found it important that numerous individuals not employed by Roche Brothers had been in the vicinity at the time of the accident, with the implication that any one of them may have placed the pallets that injured Hoyt (Order at 7). Hence, the district court concluded, a Roche Brothers employee was no more likely than someone else to have placed the pallets that injured Hoyt.

We cannot agree. In the context of Hayes’ testimony, it is a reasonable inference that the ambiguous “they” referred to the truck drivers, but it is an equally reasonable inference that “they” referred to other Roche Brothers employees, who may have occasionally left the pallets leaning vertically, despite Hayes’ “rules.” More to the point, the conclusion that Hayes was referring to truck drivers requires us to draw an inference in favor of Roche Brothers, the moving party, which is forbidden in the context of the summary judgment motion. Furthermore, with respect to the district court’s second point, in the absence of evidence connecting the truck drivers to the stacking of pallets, the fact that a number of nonemployees of Roche Brothers, including a truck driver, were in the vicinity when the accident occurred bears no weight on the question of who caused the pallets in question to be stacked vertically. 4

In summary, the record evidence supports the position that Roche Brothers employees regularly stacked empty pallets. In contrast, we have no evidence that the truck drivers handled the empty pallets in any way other than to remove them from the premises and place them in their trucks. The conclusion that truck drivers on occasion caused empty pallets to be placed vertically can only be reached by drawing inferences from Hayes’s ambiguous testimony that “they” occasionally left pallets vertically, from the general circumstances that truck drivers had access to the loading dock, and from the fact that they picked up pallets for the purpose of taking them away. While ultimately the evidence at trial may support this conclusion, it was impermissible for the district court to reach it in the context of a motion for summary judgment.

Reversed.