Second slum lords. A big enough company will most likely have their shit on lock because they have a dedicated department for it, or will make the audit process really long and arduous for likely no results.

On the other hand, slumlords are the perfect middle ground between tiny small business owners whose accounting isn't really complex, so everything is likely to be in order, and big companies who have the resources to exploit tax loopholes and not get in trouble.

A slum lord is very likely to have enough units to make accounting complex, while not being willing to spend any money doing accounting well, so they'll cut corners and fudge numbers to evade taxes as much as possible