This stuff will hit you if the things were done without permits..

Even if you all used the same app, your insight and experience allows you to make a better offer.Personally I would probably still use a spreadsheet just because you can customize it easily and it can do more if you need it.

Duplex Development Made Easy - SB 9 permits property owners to convert single-family lots into duplexes.

FWIW Its California , you probably need a permit  to do just about anything as long as you pay the fee 

If they are separate, permits would have been pulled and the city will have records of those permits.  

I agree with everything said in this post, it is a hospitality business and superlative customer service is a must. 

And I have below clause in the leaseRental Application: Only those people indicated on Tenant’s rental application are permitted to reside at the Premises, with the exception of any minor children born to, or adopted by, Tenant.

In order to comply with SEC regulations, there is no platform to publicly announce your deal to the crowd (both posting on Facebook and publicly announcing it at an event could be construed as a solicitation, which is not permitted under the structure that most sponsors in the group use).

Depending on the construction, you have to do major upgrades on electric, plan for plumbing for apartments which may not be permitted in the area for the sewer or septic.

Saying everyone hates their landlord is as stupid as saying customer service is not needed since everyone hates the retailer.