Somewhat unusual, but not surprising. 

That's unusual and it would be very difficult to find a passive investment like that.Also direct control means I know exactly what's going on.

(I have not signed and returned a copy to the tenants) Within the past week or so while renovating the vacant unit, Ive noticed an unusually high amount of activity pertaining to one of the occupied units i.e. vehicles stopping at the property for short periods of time, the tenant leaving as a passenger in a vehicle, then returing on foot, different people coming and going on foot.

It's not unusual to find 2x4 rafters or 40 amp service above the kitchen sink etc. 

However, it is clear you have an unusual partnership agreement so it is best to consult a CPA.On the other hand, real estate is not a liquid asset. 

Having said that, we try to time it with unusually high income (like selling stock or getting big bonus or a big spike in biz income).

It is not unusual for large corporate tenants to have a re agent negotiate their lease renewals and that agent expects to get paid a commission.

This seller credit for buyer side commission isn't unusual as it is exactly like seller contributions to buyer closing costs that have been done for years.Remember, you as a buyer can insist on a non-exclusive buyer representation or very short representation time period.

To me that means an account owned by a trust and that would be an unusual account in which to hold security deposits.When I had a SF property manager, they typically held the security deposits. 

But unusually for this time of the year, more Realtors see rising buyer demand in the next 3 months (13% → 16%).