That would be one major concern for me if I were in your shoes looking to make this decision. 

If there are any concerns with the property that are suspected to be causing a safety issue or potential damage to the property you can enter without notice.

For most property owners adding a single ADU to a single-family home (or even adding two ADUs to a duplex), the impact on financing options is minimal, and the benefits of additional rental income outweigh these concerns.10.

You are looking for a practical advice now to CYA.You fear you mean need some evidence of your timely and correct actions, and that’s a reasonable concern: I’d take a photo of the envelope to make sure it shows the address and the post office stamp.

TOPA still a concern but how much of a concern is it for the buyer?

Hi @Abdi Muya - Thanks for posting the concern here! 

Stay loyal and treat your CPA well, because true bargains are rare.Here're a few things to keep in mind when it comes to lower-priced CPA servicesNew inexperienced CPAs (as well as contractors, lawyers, dentists and all other specialists) often undercharge because they are desperate to get their new business going and are concerned that they won't have enough clients.

I’m concerned about rental prices and resale prices and resale value when being compared to the workforce units in the same neighborhood.

Bigger concern is making sure you have enough buffer that its not going to be an issue riding the volatility out until the rents go up enough you don't care .

However, their projects have been met with controversy in some towns, with residents concerned about aesthetics, traffic, and impact on neighborhoods.