By this bill in equity the plaintiff seeks a mandatory injunction ordering the defendant Beal (hereinafter called the defendant)^[1] to remove from his building a fire escape which, it is alleged, extends over the land of the plaintiff; she also asks to have the defendant’s building removed to the extent that it encroaches upon a passageway adjoining her land on the ground that it interferes with her “rights of free and unobstructed use of air, light, and passage.” From a final decree dismissing the bill and granting certain relief to the defendant on his counterclaim the plaintiff appeals.

The evidence is reported and the trial judge filed a statement of “findings, rulings and order for decree.” The pertinent facts, concerning which there is no dispute, are these: The plaintiff owns land which is bounded on the northeast side by land of the defendant. Both titles are derived from a common owner in the following circumstances: Prior to May 20, 1916, the lots now owned by the plaintiff and the defendant were parts of a larger parcel owned by one Shapira as trustee of the City and Suburban Real Estate Trust. On May 20, 1916, Shapira filed a petition in the Land Court for the registration of title to this parcel as shown on a plan which was filed with the petition. The lots of the plaintiff and the defendant formed a part of lot A included in that plan but were not set off as separate lots. At approximately the same time Shapira conveyed lot A to one Maguire. On January 17, 1917, the Land Court issued a decree of registration of title to lot A on Shapira’s petition but in the name of Maguire, whose name had been[*752] substituted as owner. Prior to this decree Maguire obtained permission from the city of Boston to build two buildings on lot A. One of the buildings stands on the land now owned by the defendant and was completed on March 24, 1917; the other building is on land now owned by the plaintiff and was completed on May 5, 1917.

• On September 29, 1917, a plan (dated May 17, 1916) was referred to in a certificate of title of one Brown, who then owned lot A, as hereinafter stated. By this plan lot A was subdivided into three lots: Al, A2 and A3. The plaintiff is the owner of lots A2 and A3 and the defendant owns lot Al. . Lots Al and A2 are contiguous and the controversy in this case concerns them.

The subdivision plan shows a passageway eleven feet wide between lots Al and A2 running from Allston Street, to a twelve-foot passageway^[1] in the rear. Of this eleven-foot passageway, according to the subdivision plan, six feet are on lot Al owned by the defendant and five feet are on lot A2,- the plaintiff’s lot. The building plans filed with the city contemplated that the proposed building on lot Al was, on the .southwesterly side, to be adjacent to the edge of the eleven-foot passageway; the northeasterly side of the proposed building on lot A2 was likewise to be adjacent to the edge of the passageway. Thus, had the buildings been erected as contemplated by the building plans, neither building would have encroalched upon this passageway. However, when the buildings were built they did not conform to the building plans, each building being placed approximately five feet three inches to the southwest of the position contemplated in the plans. As a result the building on lot Al extends into the eléven-foot passageway shown on the subdivision plan approximately five feet three inches throughout its entire length, that is, from Allston Street to the twelve-foot passageway in the rear. This building, except as to the fire escape, hereinafter discussed, is approximately nine inches from the property line between lots Al and A2.

[*753] The structure on each lot is a three-story brick building .used as an apartment house, and neither has been changed in any substantial respect since it was built. The defendant’s building when erected had a metal fire escape on the side adjacent to lot A2 which has remained there ever since. It is of the usual open work iron type and extends from the third story to within forty-three and one half inches from the ground. From the front to the rear it is seventeen feet long and it projects out from the wall of the building four and one half feet, with the result that it extends beyond the lot line between lots Al and A2 to the extent of three feet nine inches for its entire length.

There is at the present time a passageway between the two buildings running from Allston Street to the twelve-foot passageway in the rear, although not in the same position as that designated in the subdivision plan. In addition to the fire escape which hangs over the present passageway, a flight of concrete steps slightly over eleven feet long extends into it from' the plaintiff’s building to the extent of three feet three and five eighths inches, leaving a space of forty inches between the' steps and the fire escape. The steps, however, are entirely on the plaintiff’s land and do not extend into the passageway designated on the subdivision plan.

The plaintiff holds a transfer certificate of title to lots A2 and A3 dated July 27, 1933. The defendant holds a transfer certificate of title to lot A1 dated December 13, 1929. Each certificate referred to the lot or lots included therein as those shown on the subdivision plan.^[1] Prior to the times that the plaintiff and the defendant acquired title to her or his respective lot, there had been several transfers of title to each lot; each of the transfer certificates contained a reference to the subdivision plan similar to that appearing in the certificates of the plaintiff and the[*754] defendant. With exceptions not here material, no easements in favor of or as an encumbrance on either lot were noted on the plaintiff’s or the défendant’s certificate.

A final decree was entered dismissing the bill with costs' to the defendant Beal; it further provided that the defendant Beal has the right to maintain his building and fire escape as they now exist, and that the plaintiff execute within thirty days “an instrument of conveyance so that the passageway between lots Al and A2 . . . [as shown on the subdivision plan filed in the Land Court] may be established as of record as it now exists in fact, including an easement appurtenant to said Lot A1 for the maintenance of a fire escape substantially as it now exists as described in the findings, rulings and order for decree.”

1. No easement in favor of either lot was acquired with respect to the eleven-foot passageway designated on the subdivision plan. The Land Court by its original decree of registration issued to Maguire created no easements or rights with reference to the eleven-foot passageway. So long as there was a common ownership of the two parcels there could be no easement in favor of one lot operating as a burden on the other. Johnson v. Jordan, 2 Met. 234, 239. Mt. Holyoke Realty Corp. v. Holyoke Realty Corp. 284 Mass. 100, 105. Oldfield v. Smith, 304 Mass. 590, 593. If any easement came into existence it was only upon a severance of the common ownership. Mt. Holyoke Realty Corp. v. Holyoke Realty Cory. 284 Mass. 100, 105. Ansin v. Taylor, 262 Mass. 159, 164. There was such a severance when the common owner, who was then Brown, gave a mortgage of lot A1 to the Boston Mortgage Bond Company, and a mortgage of lots A2 and A3 to the Mooneys. Mt. Holyoke Realty Corp. v. Holyoke Realty Corp. 284 Mass. 100, 106-108. These mortgages were registered on September 29, 1917, and reference was made in them to the subdivision plan. As stated above, there had been such a reference in the certificate of Brown, the common owner and mortgagor, bearing the same date. The plan had not previously been referred to in any registered deed; thereafter it was mentioned in all deeds and certificates, including those[*755] of the plaintiff and of the defendant'. Did these references to the subdivision plan operate to give to each parcel an easement in the passageway set forth in the plan? We think that they did not.

A plan referred to in a deed becomes a part of the contract so far as may be necessary to aid in the identification of the lots and to determine the rights intended to be conveyed. Boston Water Power Co. v. Boston, 127 Mass. 374, 376. Downey v. H. P. Hood & Sons, 203 Mass. 4, 10. Carroll v. Hinchley, 316 Mass. 724, 729, and cases cited. “The purpose and effect of a reference to a plan in a deed, is a question of the intention of the parties.” Regan v. Boston Gas Light Co. 137 Mass. 37, 43. Wellwood v. Havrah Mishna Anshi Sphard Cemetery Corp. 254 Mass. 350, 354. “In determining the intent, the entire situation at the time the deeds were given must be considered. For example, whether the ways in question merely existed on paper, or were then constructed on the ground; whether they were then actually used as appurtenant to the granted premises; or whether they were remote or in close proximity.” Prentiss v. Gloucester, 236 Mass. 36, 52-53. Wellwood v. Havrah Mishna Anshi Sphard Cemetery Corp. 254 Mass. 350, 355.

In general the same principles that govern the effect to be given a plan in the case of unregistered land apply where the land is registered. Dubinsky v. Cama, 261 Mass. 47, 53. These principles are now well established. The difficulty is in applying them to a particular set of facts.

The plaintiff has directed our attention to cases holding that, where land situated on a street is conveyed according to a recorded plan on which the street is shown, the grantor and those claiming under him are estopped to deny the existence of the street for the entire distance as shown on the plan. See Farnsworth v. Taylor, 9 Gray, 162; Fox v. Union Sugar Refinery, 109 Mass. 292; Langmaid v. Higgins, 129 Mass. 353, 356; Drew v. Wiswall, 183 Mass. 554; New England Structural Co. v. Everett Distilling Co. 189 Mass. 145, 151, 152; Downey v. H. P. Hood & Sons, 203 Mass. 4, 10. This undoubtedly is a well settled principle[*756] in conveyancing, and nbthing herein decided is intended to impair it. It is not applicable, however, to the case at bar. But even this rule is not without limits. See Wellwood v. Havrah Mishna Anshi Sphard Cemetery Corp. 254 Mass. 350. In that case, at page 355, it was pointed out that in the cases in which this rule has been applied it will usually appear that the way referred to is in use or actually staked out on the land. See, for example, Rodgers v. Parker, 9 Gray, 445; Stetson v. Dow, 16 Gray, 372; Franklin Ins. Co. v. Cousens, 127 Mass. 258; New England Structural Co. v. Everett Distilling Co. 189 Mass. 145; Downey v. H. P. Hood & Sons, 203 Mass. 4.

In the case under consideration the passageway in question never in fact existed on the land. At the time of the severance of the common ownership above referred to, the buildings had been erected in their present position, and the passageway outlined on* the plan could not have come into existence in fact without removing nearly six feet of the building now owned by the defendant. We are aware that in other circumstances a reference to a- plan in a deed on which a passageway is designated may be sufficient to create rights in it. See Lagorio v. Lewenberg, 226 Mass. 464; Dubinsky v. Cama, 261 Mass. 47.- But we think on the facts here that the trial judge was right in concluding that “the passageway between lots Al and A2 as contemplated by the plan of subdivision . . . never came into existence and the plaintiff has no rights therein.”

2. The final decree provided that the defendant has the right to maintain the fire escape on his building in the-position in which it now is. We think this was error. As pointed out above, the fire escape in its present position extends over the plaintiff’s land for three feet nine inches. The defendant contends that the right to maintain the fire escape in this manner was an easement appurtenant to lot Al. We assume in the defendant’s favor that if the plaintiff’s land were not registered an appurtenant easement in favor of the defendant’s land to maintain the fire escape would exist by implication after a severance of the common ownership. See Mt. Holyoke Realty Corp. v. Hol-[*757] yoke Realty Corp. 284 Mass. 100. And the fact that the defendant’s lot is registered land does not prevent such an easement attaching as appurtenant to it even though, as here, the certificate makes no mention of it. Dubinsky v. Cama, 261 Mass. 47, 56-57. But as that case pointed out, “No easement can pass as appurtenant affecting registered land as the servient estate, which is not disclosed on its title as registered.” It is provided in § 46 of G. L. (Ter. Ed.) c. 185 that “Every petitioner receiving a certificate of title in pursuance of a decree of registration, and every subsequent purchaser of registered land taking a certificate of title for value and in good faith, shall hold the same free from all encumbrances except those noted on the certificate,” with certain exceptions not here material. Nothing appears on the original certificate or on any transfer certificate relating to lot A2 that subjects it to any easement with respect to the fire escape. Since the defendant contends that the fire escape rightly extends over the plaintiff’s land by virtue of an easement, he has the burden of establishing it. Swensen v. Marino, 306 Mass. 582, 583. Mt. Holyoke Realty Corp. v. Holyoke Realty Corp. 284 Mass. 100, 105. There is no evidence that would support a finding that the plaintiff in acquiring lot A2 was other than a purchaser for value and in good faith. She is therefore entitled to hold the property free from encumbrances not noted on her certificate. Nor was an easement acquired by adverse possession in view of G. L. (Ter. Ed.) c. 185, § 53, which provides that “No title to registered land, or easement or other right therein, in derogation of the title of the registered owner, shall be acquired by prescription or adverse possession.” New York Life Ins. Co. v. Embassy Realty Co. Inc. 289 Mass. 528, 530.

The fire escape, extending as it does over land of the plaintiff, constitutes a trespass and the plaintiff is entitled to have it removed. Zimmerman v. Finkelstein, 230 Mass. 17. New York Central Railroad v. Ayer, 239 Mass. 70. Geragosian v. Union Realty Co. 289 Mass. 104, 108-110, and cases cited. In the Geragosian case it was said at page 109, “The facts that the aggrieved owner suffers little or no[*758] damage from the trespass . . . [and] that the wrongdoer acted in good faith and would be put to disproportionate expense by removal of the trespassing structures . . . are ordinarily no reasons for denying an injunction. Rights in real property cannot ordinarily be taken from the owner at a valuation, except under the power of eminent domain. Only when there is some estoppel or laches on the part of the plaintiff ... or a refusal on his part to consent to acts necessary to the removal or-abatement which he demands . . . will an injunction ordinarily be refused. . . . The general rule is that the owner of land is entitled to an injunction for the removal of trespassing structures.” To the same effect are Westhampton Reservoir Recreation Corp. v. Hodder, 307 Mass. 288, Ferrone v. Rossi, 311 Mass. 591, 593, and Beaudoin v. Sinodinos, 313 Mass. 511, 519.

It is true that there have been cases,^[1] which strictly speaking do not come within the above mentioned exception to the general rule, where due to special circumstances relief has been denied. Some of these cases are applications of the de minimis principle; others depend on their peculiar facts which do not exist here. There is nothing in the record to take the present case out of the general rule.

3. The decree was wrong in ordering the plaintiff to execute an instrument of conveyance so that the passageway between lots Al and A2 be established as of record as it now in fact exists. The passageway as it now exists is approximately eleven feet wide between the walls of the plaintiff’s and the defendant’s buildings and all but nine inches of it is on the plaintiff’s land. No easement was ever acquired by the defendant in this passageway. Such an easement, as pointed out above, can be acquired only if it is disclosed on the certificate of title to the lot which is subjected to it. Dubinsky v. Cama, 261 Mass. 47. G. L. (Ter. Ed.) c. 185, §§ 45, 46, 57. Since no such encumbrance[*759] is noted on the plaintiff’s certificate the court below was without authority to create one. To hold otherwise would defeat the purpose of the land registration act.

4. The remaining question is whether the plaintiff is barred by laches, which was pleaded by the defendant. The judge found that she was. He found, however, that the defendant has “not been prejudiced in any way by the delay except that, due to war conditions, . . . [he] would find it exceedingly difficult if not impossible to make the change which would be necessary were the plaintiff given the relief which she seeks.”

The facts with reference to this aspect of the case, which are not in dispute, are as follows: The plaintiff acquired title to lot A2 in 1933. In 1935 she consulted counsel, and in 1937 she had the property surveyed. The bill in equity in this case was filed on August 4, 1941. “The question of laches is one of fact, and is as fully open before us on the evidence as it was before the judge.” Beaudoin v. Sinodi-nos, 313 Mass. 511, 519. Mere delay not extending beyond the period of the statute of limitations does not constitute laches. There must be delay that works some prejudice or disadvantage to the defendant. Calkins v. Wire Hardware Co. 267 Mass. 52, 69. Westhampton Reservoir Recreation Corp. v. Hodder, 307 Mass. 288. Norton v. Chioda, ante, 446. The only prejudice to the defendant is that due to war conditions it would be difficult to comply with a decree ordering the removal of the fire escape. No doubt that is an important factor to be considered by the court below in the enforcement of such a decree. But we cannot assume that these conditions will be permanent. Consequently the plaintiff should not because of that fact be barred from relief to which she otherwise would be entitled. xjThe defendant has argued that the delay of the plaintiff’s predecessors in title should be imputed to her in considering the question of laches. We do not agree. The presence of the fire escape over the plaintiff’s land constitutes a continuing trespass and she is entitled to have the question of laches determined on the basis of her own conduct; she should not be chargeable with the delay of her predecessors[*760] in title, if there was any. This conclusion is not inconsistent with anything decided in Tetrault v. Fournier, 187 Mass. 58, Fennyery v. Ransom, 170 Mass. 303, Hermanns v. Fanning, 151 Mass. 1, and Learned v. Foster, 117 Mass. 365, cited by the defendant. The finding that the plaintiff was barred by laches was error.

The final decree is reversed and a new decree is to be entered ordering the removal of so much of the defendant’s fire escape (under such terms and conditions as the Superior Court deems proper in view of war time conditions) as extends over the plaintiff’s land, with costs to the plaintiff.

So ordered.