There remain 87 families, for whom 87 private dwellings, each costing $10,000 or more, as estimated, were to be constructed. The aggregate value of these dwellings is $1,135,500. The average value is $13,000. Since the average rises so slightly above the minimum, it is clear that but few dwellings costing much more than $10,000 were to be constructed. The detailed report of the Commissioner mentions but three residences of high cost to be built respectively for $35,000, $40,000 and $50,000. These 87 families represent an average investment for both the land and the house of $17,333. An attempt to average the income of this class would be attended with less success than in any of the prior instances. The minimum cost of living for a family dwelling in one of these residences would not be far from $6,000. Doubtless but a few of them spend as small a sum as this in a year. The surmise that in some of its features building has been overdone is apparently verified by a study of the remaining permits. The 63 factories costing $579,580, and the 158 shops costing $121,445 call for so small a part of such a population as would be contained in the flats and tenements to be constructed, that we must believe that some of these latter will not be occupied at once. This conclusion accords with observation. At the same time the general magnitude of this sort of construction indicates the operation of those causes already spoken of which embarrass the growth of New York and promote the growth of Brooklyn. Manifestly the tenants of these numerous flats and the 1,168 families who are to dwell in the more modest residences belonging in part at least to the class which will not live in lower New York and which cannot endure the journey to the region above One Hundred and Tenth street. For the twelve months ending November 30th, 1887, permits were issued for 4,246 buildings, to cost $19,983,414. Among these are found dwellings for 9,585 families. Of these families, 2,856 are to dwell in 922 flats costing $3,978,592, the average investment for each family being $1,390 as against $1,338 in 1888. Two thousand eight hundred and sixty-eight families are to dwell in buildings described as stores and flats, numbering 714, and costing $4,838,938, the average investment for each family being $1,691 as against $1,752 in 1888. Two thousand three hundred and ninety-one families are to dwell in 377 tenements costing $1,879,001, the average investment for a family being $785 as against $806 in 1884. There remain 1,372 families who are to dwell in the same number of dwellings, each costing less than $10,000, and the aggregate cost being $5,320,607, the average cost per family being $3,877, as against $4,000 in 1888. Finally, there are 97 families provided for by the same number of residences, each costing over $10,000, and costing in the aggregate $1,197,400, or on the average $12,344 as against $13,000 in 1888.