Because of this limitation, the properties with ADUs in my area of investment are being comped at a discount compared to duplexes which seems reasonable because a duplex can be purchased by a house hacker or an off site RE investor but the ADU can only be purchased by a house hacker/home owner.Check this for your area. 

One last point: It is important to ask if they have any limitation on the amount of profit spread between the A-B and B-C transaction.

Hey BP,So one of the HOA's that I own a rental in is trying to pass an amendment limiting rentals to 20% of the homes in the neighborhood and all tenants and leases have to be approved by the board of directors of the HOA.From all the research I have done on BP it seems like if this passes I am SOL, and probably will have to sell. is this a correct understanding?

It doesn’t sound like a deal from the limited information.

Can we place a limit on the number of service dogs in the lease? 

@Seth Borman I have no experience when it comes to solar power and the demand the heating will put on the system. 

With our values increasing so rapidly over the past year (in particular), anyone who purchased 12 months ago has seen amazing returns on both rents and overall value of their properties.The main thing to watch out for in Seattle is the rental rules and regulations within city limits.

If you're in a residential zone, there will be limitations that you need to deal with.

The sky is the limit.

Buildable space is limited (low supply & high demand = $$)con: traffic up there is misery.