But this can be used to sue you if you don't properly disclose so I would disclose everything 

Are they tracking your financials properly?

Without proper support, removing the wall could have compromised the structure of the entire house.

Similar to a credit card.

•Business Cards & Branding: You can list both services, but if you want to avoid overwhelming potential clients, consider having two versions—one focused on PM and one on real estate sales, depending on who you’re targeting.Best Way to Generate Property Management Leads1.Target Landlords Where They Need You Most•Most landlords seek out PM services when they’re in trouble—tenants not paying, evictions, property damage, etc.

Quote from @Matthew Irish-Jones: Quote from @Mark Cruse: Yes, there will be more expenses above what's mentioned here but if this is done properly it can be kept to a minimum.

Of course our big motivation is commission but you can get commission or a referral fee or something in an off market transaction if done properly.

If you have a credit card with a high limit or a line of credit on the existing duplex that might give you some wiggle room.

Yes it's a huge problem.You should fix this correctly now.Open the walls and put in proper sound reducing insulation.

They don't know how to properly qualify an investor.Check around before making a decision.