So, things like this could not be feasible if I don't personally have enough money to pay for them.

I have a full time job so going out there and cold calling and trying to find my next deal just isn't feasible.

Is this following feasible?

well you might have something then.. you can also just going into the city or county who has jurisdiction and talk with a planner at the front desk.. they will give you zoning basic answers to density and other red flags they may see. so if it looks feasible then. you want to get with a local Civil or local land planner and or look up who the civil was on the subdivision next door if it was done in the recent past and get a sit with them. they will know whats what

So the date & time scenario is not feasible.

It sounds like you have a centralized boiler system at the property in which case you would not be able to- in a financially feasible manner- convert it to tenants paying their own heat.

It is best, if you are going to keep it, keep someone in there the whole time while it is being rehabbed--like yourself, but I understand you are out of state, so that is probably not feasible. 

I've also seen clients have great success with duplexes specifically in Malden in the past few years.Long story short: it's feasible, if challenging.

I'm trying to find out whether this is feasible in this situation.I'm looking for advice for the following:1) Can I represent myself to sell my co-op in NYC?

It is very manageable and feasible to do on the side as a "part time" job after your 9-5 or regular job.