As of 1 January 2020, the VAT was amended and provides that in cases of successive carrying out of a homogeneous activity in the same commercial site by two or more related persons or persons acting together, the turnover generated by all persons in the site for the last 12 months should be taken into account when calculating the turnover for mandatory VAT registration of a taxable person. The VAT registration threshold is BGN 50,000 (approximately EUR 25,600).
Source Opinion on the implementation of the new VAT registration provisions (unoffical translation)