The phrase "a relatively small building" is correct and usable in written English.
You can use it when describing the size of a building in comparison to others, indicating that it is smaller than average.
Example: "The town hall is a relatively small building, but it holds great historical significance for the community."
Alternatives: "a somewhat modest building" or "a fairly compact structure."
She likes the simplicity of a relatively small building with no doorman.
The space is constrained by a relatively small building site, but Hadid has loaded it with a baroque display of strange vistas.
For a price in the low to mid-$400,000s, Mr. Johnson wanted a home in a relatively small building where he could meet his neighbors.
More impressively, (Izadi et al. 2011) showed that the rapid and detailed reconstruction of building indoor scenes can be achieved; however, their work is currently limited to the reconstruction of a relatively small building scene (3 m cube) (Roth and Vona 2012).
They start as relatively small "building blocks" -- clusters of stars -- inside halos of invisible dark matter, and then, either by cold flows of gas into their centers, or by mergers with other similar building blocks, they form the large spiral (Figure 3) and elliptical (Figure 4) galaxies we observe today.
In Greenwich Village, a neighborhood fiercely proud of its low-rise character, the prospect of even a relatively small new building can prompt an outcry.
Leggat McCall has new construction projects in the Philadelphia suburbs, including Plymouth Meeting, Pa., and Mount Laurel, N.J., that stress quick construction in established markets where there is room for relatively small buildings.
Hegel considers a relatively small range of buildings: he says almost nothing, for example, about secular buildings.
The Ford Foundation building is a relatively small structure among the huge buildings of New York City, yet the experience of that space is real and pleasurable.
It is thought that, apart from a relatively small number of later buildings, the system of the Rows had reached its full extent by about 1350.
Given that it is still a relatively small agency, Sophie's responsibilities include: building much of the mathematical framework used to run advertising campaigns, building custom technology for clients, coding, client servicing, legal matters, accounting, training and recruitment.
