Everything else is clearly inbounds of the language you quote.  

English is his second language but I'm fortunate that my wife helps translate my needs into Spanish for him, but does outstanding work; fast and reasonable prices. 

But I do like to anticipate outcomes and in creating the amendment, I want to insert some language which indicates what will happen if the seller doesn't get the fix done by closing.

@Carnell WebbI highly recommend you work with a seasoned investor on your first 3 to 10 deals so you can get a clear understanding how to draft a contract, contract law, how to properly assign a contract, language that an assignment agreement should contain, what your liability is when assigning, etc.

You can rate and term refinance out of a mortgage, but not an installment sale or similar, depending on how the language on the relevant document reads. 

There are a lot of elderly people and people with a poor grasp of the English language that have become victims of these unlicensed broker frauds.

If you are adding something that negatively changes a tenants life they may resist, if it is simply common language they may have no issues.

I am just playing devils advocate in this subject .. as I have been through these deals in the 80s I worked for a big syndicator in the bay area.you can have all the indemnifications you want but the investors will revolt and sue you if the deal goes sideways.. you would be very naïve to think the language in the doc YOU prepare is going to save you from litigation.. does not mean the other party is right but you still will get sucked into the vortex and spends thousand if not hundreds of thousands.Case in point... friend of mine when I lived at Silverado in Napa county was and is a syndicator he bought a big high rise commercial building in Houston 10 years ago... well you know what happen with oil. its now a see through .. and they lost it to the bank.. investors revolted and sued him that started 2 years ago.. and its all over the local paper.. so it kills his rep and no doubt he has the same safeguards you mention.. but that simply won't stop litigation.Where I have seen rob peter to pay paul is with syndicator that had multiple partnerships.. borrow from a good partnership reserve account ( PPM said you could) loan to prop up another.. the other still can't make it and is put into BK and liquidated and the other properties are now in jepordy.. this company ( did acquisitions for them as  a broker  great gig made a ton of commish)  had 5,000 investors...

Like speak another foreign language and have a construction or loan background.  

There is the following language under the broker fee paragraph: "The aforesaid fee shall also be due upon sale of the property to any person who was introduced to the PROPERTY during the aforesaid term or any extension or who entered into an agreement to purchase during the term, during any extension or within 180 days after expiration of the term or any extension, regardless of the date that title passes, except if the SELLER has entered into an exclusive agreement with another broker in good faith, in which case the BROKER shall be entitled to receive only the difference between the fee set forth herein and any lesser net fee paid to the other broker."