I recently started an LLC and was wondering what type of success and stumbling blocks everyone has had in building their own business credit? 

Also don't forget about blocking streets, police detail and all of that need to be factored into the price. 

I will say that my impression of the Irvington/near East side is that it's block by block right now, but also that it might be up and coming if you can identify the right block early.

I have one that’s about 2 blocks from me.

Send a letter that you have paid in full the agreed amount, any “changes” gc wants additional money for were to address non-workmanlike results that were expected and ordinary, but that you are willing to pay $20 for the base trim at Home Depot prices (maybe add $30-50 trip charge for worker to go buy) as an offer in compromise or good faith.

I had to remind him that deposit has already paid for permits , engineering , surveys , cinder block already on site .

I just found a 3-unit rental one block away from a college in a Class B/C neighborhood.

They will help you with requirements and can give you a lending letter. 

I have a 2 BR house built in 1904, 2 blocks away I have a 2 story house built in 1911, and across the alley from that is a 3 story house built in 1910. 

Now is the time to launch those letters, people!