Key legal question
Whether the lump-sum deduction for a privately owned property used mainly commercially by third parties was admissible.
Extracted holding
No. The government ordinance validly excluded the lump-sum deduction for such properties; only actual maintenance costs could be deducted.
Extracted reasoning
The delegation in § 39 Abs. 4 StG was sufficiently specific, the ordinance remained within the legislature's framework, and the exclusion matched federal comparable rules.