NEW YORK CITY

The first week of December has come and gone and pretty soon it will be holiday party time. Brickunderground.com compiled a list of do's and don'ts for hosts to ensure they don't tick off building staff and neighbors. Advice includes letting the doorman and immediate neighbors know ahead of time that you're having a party; covering floors with cheap carpet, so dancing shoes don't drive downstairs neighbors batty; quieting down by 10 or 11 p.m.; and making sure party guests don't spill out of the apartment into common areas. If you're the one throwing the party, you may think these rules are an 11 on a Scrooge scale of 1-10. Not so much if you're the poor soul on 6C being serenaded by cackling merry people clomping up the stairs, past his door, to smoke on the roof. 6C probably didn't sign up for three or more hours' worth of foot traffic and noise. So even if party rules are already covered in your bylaws, the time is ripe for boards to distribute gentle reminders to residents who plan to host parties, to make sure guests have a good time without disturbing the rest of the building residents.

A READER ASKS: Some of the tenants in our co-op have dogs. When they go away for the weekend or on vacation, they hire professional dog-walkers. This causes friction among tenants who don't have pets because strangers are coming in and out of the building, usually with packs of rowdy dogs. And what if someone masquerading as a dog-walker robs an apartment in our building? It hasn't happened to us yet, we want to safeguard our building against all these issues. What can we do?

When we think of co-op or condo amenities, we tend to think of fitness centers, bike rooms, storage facilities, and garages. But one amenity that nobody should overlook is the playroom. Here we review why, as well as the protections your building will need to have in place.

Take a look at the numbers. How many children live in the building? If your building has experienced a baby boom, the number could have jumped from 3 to 25. Even if you have only a few kids, a playroom is a solid investment. It's the perfect space to host classes for toddlers and stage other activities. Parents can also rent out the playroom for birthday parties and play dates or use it on rainy days.

A basement storage facility can be a double-win for building owners. It provides co-ops and condos with a new source of income at relatively little cost, while offering building residents a desirable additional service. However, it can also be a source of problems, if you don't plan carefully.

Not long ago, the rat situation at an Upper West Side condominium got so bad residents who would return home late at night would walk in the middle of the street. According to one of the condo's board members, rats would be scurrying back and forth from the tree wells and running around people's ankles.

The board member, who asked to remain anonymous because of the stigma associated with rats, was involved in several local community groups. Therefore, she knew about the city's Rodent Academy program — or Rat Academy, as it is often called. Started in 2009, the program offers a half-day course on how to identify rat infestations and what to do about them.

A READER ASKS: A shareholder in our co-op has moved out and now has a subtenant living in his unit. This subtenant went through all the proper co-op application channels, including signing an appropriate sublease. Now this subtenant wants to bring in an unrelated roommate. Can the board require the roommate to go through the same application process as the original subtenant, or is the original subtenant covered under the New York Real Property Law (RPL) Section 235f allowing her to bring in her own roommate? I know the law applies to tenants. Does it also apply to subtenants?

The client’s tale: A managing agent for a New York co-op neglected to pay water and sewer bills for one of three water meters for several years. While performing an audit, the holder of the property’s mortgage discovered the problems and shortly thereafter received an in rem notice from the New York City Department of Finance. As a protective measure, the mortgage-holder advanced payment of the water bills with accrued interest and penalties. It then sent several letters to the managing agent requesting reimbursement. The agent ignored the letters.

You're on the board of a 74-unit co-op with 600 windows, which, the shareholders say, need to be replaced. What happens if, when you are finally ready to tackle the project, you discover it's going to cost an estimated half a million dollars? How do you proceed? Here we review the pros and cons of five standard options so the task doesn't feel as daunting.

What happens when you want to sublet your co-op to short-term renters for a month or two at a time? In the latest "Ask Real Estate" column in The New York Times, Ronda Kaysen sets a shareholder who wants to do just that straight. While the law may "allow you to turn your apartment into an extended-stay hotel," she explains, the co-op board might feel quite differently. Renting an apartment for fewer than 30 days violates state law, but few co-ops allow shareholders to sublet their apartments for short periods. You have to read the fine print on that proprietary lease carefully — it may include provisions against short-term leases. Even if it doesn't, you still have to get through the approval process. Since boards typically meet once a month, it may be weeks before a prospective tenant is approved and by then they will have probably found another place to crash without all the red tape.

It may be a few more weeks until winter arrives, but it looks like snow may be arriving, well, now. No time like the present, then, to review New York City's snow removal rules for buildings within its boroughs. Mark B. Levine, vice president of business development at Excel Bradshaw Management Group, explains that New York City’s Department of Sanitation requires snow to be removed no later than four hours after it's done snowing, or no later than 11 a.m., if it was done snowing after 9 p.m. the night before. In EBMG's latest video, Levine offers tips on how to deal with snow in case it can’t be removed because of packed ice or other conditions. Buildings are allowed to place down cat litter, ice melt or anything that provides traction. Don't shovel snow into streets ever, warns Levine — it's illegal. And remember: Safety first! So keep hydrants clear at all times. Not complying by these rules can subject buildings to fines ranging from $100 to $350, per infraction. Check out EBMG's video here.