After its commencement the building seems to have struggled on for eight years; when, for want of funds, it remained stationary until 1552, although some of the altars had been consecrated by the Bishop of Mégare sixteen years previously. In 1552 it was helped on again by Lenten offerings, in return for dispensations to consume butter and milk. How much these dispensations produced, and how long the funds lasted, we are not informed; but civil war and religious troubles stopped the works again, and it was not until 1624 that they were resumed. Both Sauval and du Breul speak of the choir having been commenced in that year, and the latter's description of it is interesting as showing its original form. "Le chœur est un des plus beaux et un des plus grands de Paris après celui de Notre-Dame, large, spacieux, garni de quatre rangées de chaises; l'autel est fort haut en forme de frontispice, enrichi de six colonnes de marbre, d'un riche tableau au fond et d'un tabernacle ample et grand de bois ciselé et doré. Toute la clôture de ce chœur est composée de piliers de cuivre et de marbre. Au derrière est un autre autel de bois où l'art de la menuiserie n'est pas épargné, non plus que l'or et le marbre, et dans cet autel est le sainct ciboire où repose le saint Sacrement." Of the west front, the destruction of which, with two chapels erected by Colbert and decorated by Mignard, is the cause of the disproportion of length to height, Du Breul thus speaks: "Le portail est fort massif, illustré d'ouvrages et ciselures de pierre. Au-dessus de la grande porte par dehors est une galerie environnée de balustres; au deux coings de ce portail sont commencées deux grosses tours. En celle de main droicte sont les cloches. Aux deux costés de devant sont les images de pierre de Saint Eustache et de Sainte Agnès, patrons de la dite église et au dehors un assez ample parvis entouré de piliers." Writing a century later Piganiol de la Force only speaks of this part of the church. "Il était formé par six piliers buttants d'environ trente pieds de saillie au delà du pignon, dont deux aux encoignures de dix pieds d'épaisseur; deux autres de treize pieds servaient à soutenir la poussée des arcades intérieures qui exigeait une grande solidité. Ces quatre piliers formaient trois travées; dans celle du milieu était la porte d'entrée; les deux autres avaient été construites pour porter deux tours, et dans leur intérieur M. Colbert avait fait construire deux chapelles, l'une pour les mariages et l'autre pour les fonts."
The church was finished and consecrated by Jean de Gondy, first archbishop of Paris, on the 26th April, 1637. Round the altar were ten statues, which, according to the taste of the day, were portraits of contemporaries, although representing sacred personages. They were by Jacques Sarrazin. Louis XIII. was the embodiment of S. Louis; Anne d'Autriche and the future Grande monarque were allowed to represent the Blessed Virgin and her Child. Above these were the patron saints.
It must be remembered by critics who find fault with the disproportion between length and height of S. Eustache, that an entire bay of the nave and two chapels were demolished with the west front, thus reducing the length. One of the chapels, erected at Colbert's expense, must have been of value artistically, certainly more so than the present west front which was substituted; for Mignard's frescoes are immortalised by Molière in his Gloire du Val-de-Grâce. They represented the Heavens with the Almighty surrounded by Angels, the Circumcision, and the Baptism of Christ:
"Colbert, dont le bon goût suit celui de son maître,
A senti même charme et nous le fait paraître.
Ce vigoureux génie au travail si constant,
Dont la vaste prudence à tous emplois s'étend,
Qui du choix souverain tient par son haut mérite
Du commerce et des arts la suprême conduite,
A d'une noble idée enfanté le dessein,
Qu'il confie au talent de cette docte main,
Et dont il veut par elle attacher la richesse
Aux sacrés murs du temple où son cœur s'intéresse (St-Eust.).
La voilà cette main qui se met en chaleur;
Elle prend les pinceaux, trace, étend la couleur;
Empâte, adoucit, touche et ne fait nulle pose.
Voilà qu'elle a fini: l'ouvrage aux yeux s'expose,
Et nous y découvrons aux yeux des grands experts
Trois miracles de l'art en trois tableaux divers."
The other chapel was decorated by Charles de Lafosse, a pupil of Lebrun, and the painter of the dome of the Invalides. The subjects were God, surrounded by the four Evangelists, blessing Adam and Eve, and the marriage of the Virgin and S. Joseph. These chapels were erected respectively for baptisms and marriages.
The present west front, ugly and lumbering though it be, with its Doric portal and Corinthian gallery, had a royal prince to usher it into the world, no less a personage than the Duc de Chartres, Philippe-Egalité. Had it been built up in front of S. Nicholas du Chardonnet, or any church of that period, it might have passed muster; but tacked on to S. Eustache, it is completely out of place. Were the curé privileged to give the Papal benediction, said an 18th century critic, this porch might have some use; but its only merit is that it was built upon a sufficiently large scale to save it from insignificance. Let us turn to the south door, constructed under François Ier, but much restored since the last siege. Never completely finished, as regards statues and other ornament, it was so terribly knocked about by the Communists, that niches, tracery, corbels, and glass had to be renewed; but perhaps, had it not suffered so much destruction in 1871, we should never have had the opportunity of admiring it in its completed beauty.
The doors are divided by a pier surmounted by a figure of the Virgin and Child under an elaborately carved canopy, which stands out upon the plain, undecorated lintel. In three little niches under these figures are statuettes representing Faith, Hope, and Charity. In the voussure above the window are niches for some fifty statuettes, which are still wanting; on either side are statues of Joachim, S. Anne and two Angels bearing censers. The niches are formed of pilasters with a pediment, and capitals composed of little canopies mixed with acanthus leaves. All the details, the fantastic figures upon the stylobate, the ornament of the pilasters, and the canopies, are in the best style of the Renaissance. Two rows of arcades lead up to the rose window, flanked on each side by graceful turrets. In the centre of the gable is a smaller rose, surmounted by a stag's head with a crucifix between the horns, emblem of the conversion of the warrior Saint. A curious sundial is fixed to the wall between the two arcades; and at the intersection of the transepts and nave is an open-work turret. Between the chapels are Composite pilasters supporting the cornice; the capitals are enriched with masks, Angel's heads, monograms, and divers emblems; in one case the double L L crowned, in another, foliage, animals, and Genii. Flying buttresses support the nave, choir, and transepts; and a multitude of gargoyles, fantastic in design, representing men, women, and children, with foliage terminations, and mostly winged, surround the pilasters of the aisles. On one of these is the date 1629.
The building, which blocks up a part of the chapel of Our Lady, was another excrescence of the reign of Louis XIV., and the work of Moreaux; it is used as a treasury and vestry. Above the chapel of the Virgin is a belfry erected in the 17th century, surmounted by a cross and the ship of the city of Paris. The bell weighs 2,500 kilogrammes. It was preserved by the Revolutionists in consequence of its usefulness; but a shell from Montmartre on the 25th of May, 1871 (during the Commune), set fire to the steeple. The blaze was soon extinguished, but not before it had done a considerable amount of harm. The north door is of later date, 1640. It has two turrets, in one of which is a staircase leading up to the presbytery. S. Eustache, costumed as a Roman warrior, guards the doorway upon the central pillar; while S. Denis bearing a palm, and S. Geneviève with a lamb at her feet, keep watch upon each side. The socles are ornamented with the Cardinal Virtues of Prudence, Courage, Justice, and Temperance, which were discovered some years ago, hidden behind a shop for the sale of religious books and images which obstructed the entrance to the passage. The capital of one of the pilasters upon this side of the church is well worth attentive study. In the midst of some foliage is a child bearing a basket of fruit, and on each side are two young and beautiful Genii forming a sort of buttress to the abacus.