"The Birmingham Jewellery quarter", published by English Heritage states that the Rose Villa Tavern building is 1919-20. However , as Lyn has already said, kellys states that there was an earlier pub. however it looks as if it was a smaller pub. Now The rose villa is no 173 Warstone Lane. The first mention of it I can find is in 1867 , when the Landlord was Edward Moore. It is listed in the 1867 Directory and Moore is listed in the Birmingham Post on 1st August 1967 as having been fined 2/6 (2 shillings and sixpence to our younger readers) for keeping improper hours. Here the number is 170, and 173 is occupied by someone else. No 170 is not listed in the 1862 directory , amd in then 1858, it is occupied by a jeweller Jabez Taylor. So I would guress that the first Roise villa Tavern was built/converted between 1862 and 1867. It then seems to be a proper pub , as itnis listed by name, named not just a beerhouse. Edward Moore was still landlord in 1880-1884 and is so listed till 1888, but is described as a beer retailer, which usually meant the place had only a beerhouse licence, and in 1888, when there was a licence transfer to C.F.Woodbridge, it is described as a beerhouse. In 1892 Kellys do not list it. In 1883 the licence is transferred to A.C.Taylor as a Beer (On) licence, which seems to mean it is still a beerhouse, but in 1895 it is listed by name in Kellys, which implies it is now a full public house. However it is now listed as no 172 rather than 170, which means it must have absorbed no 172. No 173 is still a confectioner.
All this implies to me that the Rose villa Tavern started as a full pub, between 1862 & 1867. Between 1884 and 1888 it transferred to a beerhouse licence. Between 1893 and 1895 it absorbed the next door business (possibly rebuilding) and by 1895 it has gained a full licence. In 1919-21 it is rebuilt absorbing no 173 Warstone Lane in the process.