Will a pending Domestic Violence/ destruction of property charge show up on a background check for an apartment in Washington?

it will show up on background check as an arrest and if convicted as a conviction.

What happens if exceed 90 days of unemployment on OPT?

Under the rules of your status you are not allowed to be unemployed longer that a cumulative period of 90 days.

N400 - Interview schedule delay

I agree that hiring an immigration lawyer could be a good idea. that, however, will not expedite the bio-metrics.

You can apply for a new visa but do not have to do that. Not at all.

A normal process now. It is how it is done. True that in Boston they practice same day naturalization but not always.

Conditional Permanent Residence - Retirement Benefit?

You should post into a forum where attorneys dealing with this kind of stuff can assist you. Not immigration forum.

You can file after the fact but need the I 485 receipt to reply on when you do.

Can I visit someone with a warrant?

Talk to an attorney practicing criminal defense law in that jurisdiction.

Will I need to go through the H1-B visa lottery if I had an H1-B visa earlier but never worked on it? (please see details)

I agree with both colleagues. It is likely that you were not counted after all. Such would be consistent with the current USCIS policy. With that...

Your question was classified under immigration law. I have changed the practice area to Workers Compensation so you can hopefully get the answers...