The phrase "although the base of" is correct and usable in written English.
It can be used to introduce a contrast or exception regarding the foundation or starting point of a subject being discussed.
Example: "Although the base of the structure was solid, the upper levels showed signs of instability."
Alternatives: "even though the foundation of" or "despite the base of".
Red Bull is an upstart by comparison, having existed by that name only since 2005, although the base of the team had existed for a few years before that.
It was discovered in 1988 and had been broken into many pieces, although the base of the stela was still in situ.
Little of the original gatehouse remains, due to 18th and 19th century building work, although the base of the towers remains medieval.
An emergency shelter has been built on top of the observatory tower for the benefit of those caught out by bad weather, and, although the base of the tower is slightly lower than the true summit of the mountain, the roof of the shelter overtops the trig point by several feet, making it the highest man-made structure in the UK.
Although the base of the item (i.e. the surface facing the rack) was exposed to UV-C light emitted from the base of the cabinet, any sample point in direct contact with the lattice bars remained protected from the rays.
These results are consistent with the acceleration of cerebellar tumours in Ptc1+/−; p53−/− mice as compared with Ptc1+/− siblings (Wetmore et al, 2001), although the bases of such acceleration is unknown.
Even today, although the base for the consumption of culture has widened and been democratised, it remains a class-based activity.
Although commerce and industry form the base of Vienna's economy, government and public administration on all levels is also a major employer in the Austrian capital.
Indirect development probably evolved at the base of Mandibulata, although it could have evolved several times convergently in this group.
Although the base rate of interest is 4.5%, most credit cards charge upwards of 40%, plus an annual fee.
As noted by Tanner et al. [ 25], although the base rate of co-occurring NSSI and firesetting is low among school-based adolescents, this subgroup represents a significant minority (25%) of all adolescents with a past suicide attempt.
