Listsource mail merge question

[Jordan Meade]

I am about to do my first direct mail marketing campaign. I bought a list of about 500 absentee owned properties in my area. Around 125 of them are business entities and don't have a first and last name so when I uploaded the file to open letter marketing, the proofs came back with no name on the address and a blank space in the greeting of the letter. 

Is it worth spending the money to send to these people? Should I manually add the name of the business that owns the property manually into one of the .csv fields? Or do you think that's not something that will change the response rate?