Hospitable is a lot of people's favorite and is very strong on guest messages with their AI platform. 

I have attempted to go the seller financing route, but every seller has declined that option.

I am exploring options for purchasing a multi-unit property with a SFH (2b, 1ba, with a detached garage) and 2 ADU units (1- 2b/1ba and 1- 1b/1ba) in Los Angeles.

There are larger options but these tend to need some TLC.For your initial search, Zillow can give you an idea of home prices and amenities in your price range.

That would seem like a better option, assuming you have the cash for the down payment.

For most lenders it typically requires having at least 1-2 builds previously completed, but I'm sure there are other options if it happens to be your first.

Also find out what rights you have to terminate the lease as that may be the best option. 

If you can get your loan amount up to $75k and value $100k+ you should have additional options.

The MLS, due to high competition and normally high asking prices, wouldn't be the best option to find deals. 

Monitor metrics like click-through rates, engagement, and conversions, and A/B test different ad copies, images, and targeting options to optimize performance.Ensure your ad links to a landing page with a clear call-to-action where sellers can easily contact you.