If they're serious, I encourage them to send me the request which I accept (after I've also made our House Rules clear).

You can also just accept certain kinds of pets, breeds, or sizes as a third option.

If there is no other way to evict the tenants and instead I offered to renovate the garden level into a two bedroom apartment would they have to accept that offer? 

Therefore, only accepting S8 is likely a violation of this law and can get you sued by the city (unlikely) or a prospect (way more likely). 

In that situation I purchased a SF property 4 hours away from me this year as a fix-n-flip and to test the hypothesis that long distance fix-n-flips could be viable investments. 

Weeks later, it was communicated to us that the underwriter wouldn’t accept the ones signed by only one of us – legally binding for LLCs – and required we send amended copies of leases signed by both of us.

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The seller accepted the offer with terms of accepting backup offers until January 8th, which I am fine with.

Many agents offer a temporary agreement (Zillow uses 7 days) for a few showings or a single property, so you can test the relationship without a long-term commitment.